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    Wyświetlanie 1-32 z 32
    Tytuł:
    Optical Properties of a Monoclinic Insulator Cu(H₂O)₂(en)SO₄
    Autorzy:
    Sýkora, R.
    Postava, K.
    Legut, D.
    Tarasenko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386676.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.-e
    78.40.-q
    Opis:
    We compare theoretically predicted, by means of ab-initio calculations, dielectric tensor and related experimental values obtained from Mueller-ellipsometry measurements of an insulating monoclinic (optically biaxial) crystal of Cu(H₂O)₂(en)SO₄, en=C₂H₈N₂. We concentrate on the static limit, ω→ 0.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 469-471
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Absorption Spectrum of Ni(II) Ions Doped in Lithium Sodium Potassium Sulphate Single Crystal
    Autorzy:
    Rama Kumar, R.
    Venkata Reddy, B. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933457.pdf
    Data publikacji:
    1995-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.-q
    78.50.-w
    Opis:
    The optical absorption spectra of lithium sodium potassium sulphate doped Ni$\text{}^{2+}$ ions at 300 and 77 K was recorded. The observed bands are assigned as transitions from the ground state $\text{}^{3}$A$\text{}_{2g}$(F) to various excited triplet and singlet states of the Ni$\text{}^{2+}$ ion in octahedral symmetry. The splittings observed for the bands $\text{}^{3}$T$\text{}_{1g}$(F) and $\text{}^{3}$T$\text{}_{2g}$(F) at liquid nitrogen temperature have been explained as due to spin-orbit interaction. The oscillator strengths of the transitions were computed from the area under the curves. From a detailed analysis of the bands of the spectrum, the crystal field parameters B, C, Dq and ξ are evaluated.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 6; 1023-1029
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence and Transient Absorption of CdWO$\text{}_{4}$ Crystals
    Autorzy:
    Millers, D.
    Grigorjeva, L.
    Chernov, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2010943.pdf
    Data publikacji:
    1999-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.60.Ya
    78.40.-q
    Opis:
    Luminescence and transient absorption of the oxygen-deficient CdWO$\text{}_{4}$ crystal were studied. The electron transitions from the excited state of the luminescence center to some higher energy state are responsible for the transient absorption observed. The scheme of luminescence center levels is proposed from the obtained experimental results.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 6; 965-969
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Absorption of Some Glycine Crystals and their Aqueous Solutions
    Autorzy:
    Koralewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035746.pdf
    Data publikacji:
    2003-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.-e
    78.40.-q
    Opis:
    UV absorption spectra of glycine crystals, i.e. triglycine sulphate, selenate, diglycine sulphate as well as their deuterated analogues in solid state and aqueous solutions are given. Results are compared with the electronic transition energies calculated by LCAO INDO method for glycine molecule and ion, assuming their crystal geometry.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 5; 459-470
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Characterization of Semiconductor CuCl Nanocrystals
    Autorzy:
    Mahtout, S.
    Belkhir, M. A.
    Samah, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037157.pdf
    Data publikacji:
    2004-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.-n
    78.40.Fy
    78.40.-q
    Opis:
    CuCl nanocrystals were elaborated in a NaCl ionic matrix by doping the latter with copper powder during growth. Optical absorption measurements revealed nanocrystals with a mean size of order 32 Å. This is consolidated by the Raman scattering measurements which showed nanodomains of similar size. X-ray diffraction measurements indicate a good crystallinity of the matrix and confirm the presence of CuCl nanocrystals within our samples. The annealing effect at 300˚C showed an increase in CuCl nanocrystal size with annealing time and demonstrated clearly the existence of a compound containing copper within our samples.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 3; 279-286
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tuning Optical Absorption Edge by Composition and Temperature in $TlGaS_{2x}Se_{2(1-x)}$ Layered Mixed Crystals (0 ≤ x ≤ 1)
    Autorzy:
    Gasanly, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418284.pdf
    Data publikacji:
    2012-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ci
    78.40.-q
    78.40.Fy
    Opis:
    Optical properties of $TlGaS_{2x}Se_{2(1-x)}$ mixed crystals (0 ≤ x ≤1) have been studied using the transmission and reflection measurements in the wavelength range of 400-1100 nm. The optical indirect band gap energies were determined through the analysis of the absorption data. It was found that the energy band gaps increase with increase of sulfur atoms content in $TlGaS_{2x}Se_{2(1-x)}$ mixed crystals. From the transmission measurements carried out in the temperature range of 10-300 K, the rates of change of the indirect band gaps with temperature were established for the different compositions of mixed crystals studied.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 4; 728-731
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Absorption and Reflection Studies of Tl$\text{}_{4}$InGa$\text{}_{3}$S$\text{}_{8}$ Layered Single Crystals
    Autorzy:
    Goksen, K.
    Gasanly, N. M.
    Ozkan, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047363.pdf
    Data publikacji:
    2007-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ci
    78.40.-q
    78.40.Fy
    Opis:
    The optical properties of Tl$\text{}_{4}$InGa$\text{}_{3}$S$\text{}_{8}$ layered single crystals have been studied by means of transmission and reflection measurements in the wavelength region between 400 and 1100 nm. The analysis of the room temperature absorption data revealed the presence of both optical indirect and direct transitions with band gap energies of 2.40 and 2.61 eV, respectively. Transmission measurements carried out in the temperature range of 10-300 K revealed the rate of change of the indirect band gap with temperature asγ=-6.0×10$\text{}^{-4}$ eV/K. The absolute zero value of the band gap energy was obtained as E$\text{}_{gi}$(0)= 2.52 eV. The dispersion of the refractive index is discussed in terms of the Wemple-DiDomenico single-effective-oscillator model. The refractive index dispersion parameters: oscillator energy, dispersion energy, oscillator strength, and zero-frequency refractive index were found to be 5.07 eV, 26.67 eV, 8.82×10$\text{}^{13}$ m$\text{}^{-2}$, and 2.50, respectively.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 1; 93-100
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton Electro-Absorption at Non-Zero Wave Vector
    Autorzy:
    Slawik, M.
    Petelenz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933598.pdf
    Data publikacji:
    1995-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.Jw
    78.20.-e
    78.40.-q
    Opis:
    Based on a previously proposed two-dimensional model of a polyacene crystal, the contributions to the electro-absorption signal from different points of the exciton Brillouin zone are calculated. They are shown to differ substantially both in amplitude and in shape. This makes electro-absorption spectra very sensitive to vibronic coupling. On the one hand, the new factor is a potential complication in theoretical interpretations. On the other hand, it favours electro-absorption spectroscopy as a promising experimental tool to study vibronic effects.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 2; 401-409
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of $Cu^{2+}$ and $Cu^{3+}$ Cations on the Optical Properties of $Bi_{12}SiO_{20}:Cu$
    Autorzy:
    Petkova, P.
    Petkov, S.
    Tacheva, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490938.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ci
    78.30.-j
    78.40.-q
    Opis:
    The absorption spectrum of $Bi_{12}SiO_{20}:Cu$ is measured in the spectral region 0.195-2.95 eV. The validity of the Urbach rule (2.08-2.95 eV) has been also verified. The photochromic effect of these samples in far IR region is investigated. The energy level diagram of $Cu^{3+}$ cations in Bi-octahedrons is presented.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 149-151
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Investigations of Charge Transfer Salt VINΦ$\text{}_{2}$(TCNQ)$\text{}_{2}$
    Autorzy:
    Łapiński, A.
    Świetlik, R.
    Strzelecka, H.
    Veber, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933382.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.38.+i
    78.30.Jw
    78.40.-q
    Opis:
    VINΦ$\text{}_{2}$(TCNQ)$\text{}_{2}$ is a salt with two different, non-parallel TCNQ stacks. The polarized reflectance spectra from single crystals in the IR region 660-5200 cm$\text{}^{-1}$, the powder absorption spectra 400-45000 cm$\text{}^{-1}$ and FT-NIR Raman spectra of VINΦ$\text{}_{2}$(TCNQ)$\text{}_{2}$ are measured at room temperature. Moreover, the temperature dependence of powder absorption spectra in the frequency range 400-7900 cm$\text{}^{-1}$ are studied. The nature of electronic bands, the anisotropy of optical conductivity, the temperature dependence of some vibrational bands and the charge distribution on different TCNQ stacks are discussed.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 835-841
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Experimental Method for Determination of the Refractive Index of Liquid Samples Using Michelson Interferometer
    Autorzy:
    Abbas, B.
    Alshikh Khalil, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191212.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ci
    78.40.-q
    07.60.Ly
    Opis:
    A new experimental and theoretical method has been presented for measuring the refractive index of liquids and transparent solids. The experimental setup is based on a modified version of the Michelson interferometer employing a rotation stage. This technique allows us the determination of the refractive index of a given liquid (or a transparent sample) accurately to high precision, with an accuracy limited only by the precision in the determination of the rotation angle.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 59-63
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Model for Luminescence Center Excitation in PbWO_{4}
    Autorzy:
    Millers, D.
    Grigorjeva, L.
    Chernov, S.
    Pankratov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2010944.pdf
    Data publikacji:
    1999-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.-q
    78.60.Ya
    61.72.Cc
    Opis:
    The luminescence and transient absorption of PbWO$\text{}_{4}$ crystals were studied. The electron beam (10 ns, E≈270 keV) was used as excitation source. The kinetics of luminescence is complicated - the prompt rise of luminescence intensity is followed by a slow (τ$\text{}_{r}$≈100 ns) rise. The luminescence decay at 80 K is nearly exponential with τ$\text{}_{d}$≈4.0- 4.5 μs. The decay kinetics of transient absorption at 3.5 eV can be described roughly by two exponents with time constants τ$\text{}_{1}$≈100 ns and τ$\text{}_{2}$≈4.0 μs. A common process responsible for absorption relaxation and luminescence rise is suggested. The luminescence center excitation occurs during recombination process via Pb$\text{}^{2+}$ excited state formation and subsequent energy transfer to WO$\text{}_{4}^{2-}$ group.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 6; 971-976
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of HRT ZnO Film on Optical Spectra of Transmission in CdS/CdTe Solar Elements
    Autorzy:
    Danylov, A.
    Ilchuk, H.
    Petrus, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030908.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ci
    78.40.-q
    78.67.Pt
    88.40.jm
    Opis:
    The comprehensive analysis of transmission spectra for light propagated through ITO/ZnO/CdS multilayers to solar cell active layer of CdTe is performed. Optimal thickness of ZnO high resistive oxide supplying minimal optical losses in CdTe solar cell working range was determined. We get the maximal light transmission to active layer for ZnO film with thickness of 230 nm. The advantages of glass superstrate for multilayer structure with ZnO upper layer is discussed in comparison with the structure with ITO upper layer. Calculation of transmittance for textured surfaces of top face of solar element showed significant minimization of optical losses in the structure with ITO upper layer textured by inverted pyramids while for textured glass superstrate there is no ponderable profit as compared to multilayer structure with planar surface.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 981-983
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Studies of Polyoxometalates and their Complexes with Lanthanide(III) Ions in Solution
    Autorzy:
    Lis, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945607.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.62.Hk
    78.40.-q
    78.40.Ha
    78.55.-m
    Opis:
    The results of investigations related to physico-chemical properties, synthesis and structure of polyoxometalates and their lanthanide(III) complexes are briefly reviewed. Useful techniques for the verification of polyoxometalate compositions and the determination of components are compared. Complexation of metal ions, especially of lanthanide(III) ions, with polyoxometalates using absorption (in the UV-visible and the near IR region) and luminescence spectroscopy methods are presented. Absorption hypersensitive transitions of certain lanthanide(III) ions and laser-induced europium(III) ion luminescence spectroscopy are shown to be useful in complexation investigations. The significance of some polyoxometalate complexes as potential magnetic resonance imaging agents and in biological studies as antiviral agents are discussed.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 275-283
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Characterization of Ethylenediamine-di(o-hydroxyphenyl)acetic Acid and its Complexes with Lanthanide(III) Ions
    Autorzy:
    Hnatejko, Z.
    Lis, S.
    Elbanowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945635.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.-m
    42.62.Hk
    78.40.Ha
    78.40.-q
    Opis:
    Binding properties of ethylenediaminedi(o-hydroxyphenyl)acetic acid (EHPG) with lanthanide(III) ions were studied using spectroscopic methods. Luminescence intensity and lifetime of the Tb(III) ion were measured in a wide pH range in order to characterize the Ln-EHPG complexation. The calculated hydration number of the Tb-EHPG system proved the replacement of six water molecules by the EHPG ligand in the inner coordination sphere of Tb(III). Energy transfer from Tb(III) to Eu(III) in the Tb(III)-EHPG-Eu(III) system indicated an existence of only monomeric form of the Tb-EHPG complex. Analysis of the ^1H NMR and FTIR spectra of the EHPG ligand and its complexes with lanthanide(III) ions confirmed the hexadentate manner of EHPG complexation with the lanthanides. The system of Dy(III)-EHPG, showing a linear dependence of luminescence intensity (λ$\text{}_{em}$=578 nm) of Dy(III) on its concentration, in the range of 3.3×10-7 to 1×10-5 mol. l-1, can be applied for spectrofluorimetric determination of Dy(III).
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 353-359
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Spectroscopic Study of Europium(III) in Heteropolyanion [EuP$\text{}_{5}$W$\text{}_{30}$O$\text{}_{110}$]$\text{}^{12-}$
    Autorzy:
    Lis, S.
    Elbanowski, M.
    But, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945636.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Ha
    78.40.-q
    42.62.Hk
    78.55.-m
    Opis:
    The heteropolyanions of Preyssler anion [NaP$\text{}_{5}$W$\text{}_{30}$O$\text{}_{110}$]$\text{}^{14-}$ and its europium-encrypted derivative [EuP$\text{}_{5}$W$\text{}_{30}$O$\text{}_{110}$]$\text{}^{12-}$ were prepared and spectroscopically characterized. The compositions of these heteropolyanions were verified based on the results from elemental and thermogravimetric analysis and the data of spectrophotometric determination of tungsten contents. Absorption in the UV-vis and IR region and luminescence spectra, as well as results of the laser-induced europium ion luminescence spectroscopy, obtained for solid complexes and their solutions, were analysed. Both in solid and solution the europium-encrypted derivative has three water molecules of hydration.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 361-366
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Localized Electric Field in the Type-II InAs/GaAsSb/GaAs Structure
    Autorzy:
    Lee, S.
    Kim, J.
    Yoon, S.
    Kim, Y.
    Honsberg, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398577.pdf
    Data publikacji:
    2016-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Fd
    78.40.-q
    73.40.Lq
    73.50.Pz
    Opis:
    The effect of localized electric field (F) was investigated in the type-II InAs/GaAsSb/GaAs structures. To compare type-I to type-II, two types of samples with different Sb contents was grown by molecular beam epitaxy, whose Sb contents are 3% (type-I) and 16% (type-II), respectively. In the both samples, we performed excitation power dependent-photoreflectance at 10 K and the result showed that the period of the Franz-Keldysh oscillation, revealed above the band gap $(E_{g})$ of GaAs, was broadened in the only type-II system, which means that F was also increased because it is proportional to the period of the Franz-Keldysh oscillation while the period of the Franz-Keldysh oscillations stayed unchanged in type-I system. This phenomenon is explained by that the F was affected by the band bending effect caused by the spatially separated photo-excited carriers in the interface between GaAsSb and GaAs. The F changed linearly as a function of square root of excitation power as expected for the F. Moreover, F was calculated using fast Fourier transform method for a qualitative analysis, which is in a good agreement with the theory of triangular well approximation.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 5; 1213-1216
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time Decay of Stable Absorption of Gamma Irradiated LNO, LNO:Cu and YAP:Ce Crystals
    Autorzy:
    Potera, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205403.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.-x
    78.40.-q
    61.72.jn
    Opis:
    The present work is devoted to investigation of stability of stable color centers that are induced by gamma radiation in pure $LiNbO_{3}$, Cu-doped $LiNbO_{3}$ and Ce-doped $YAlO_{3}$ single crystals
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 774-776
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extension of the p-Spectrum Method to the Higher Frequencies
    Autorzy:
    Pałka, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399394.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.57.Ty
    78.20.Ci
    78.40.-q
    78.47.jg
    Opis:
    The p-spectrum method is a time domain spectroscopy-based technique for reflection analysis of materials (including explosives) that takes into account only part of the reflected signal, which is next analyzed via the Fourier transform. The method is limited to the frequencies of about 1.8 THz due to the pulse properties of our time domain spectroscopy setup. In this paper we theoretically prove that application of a shorter pulse can increase this frequency range up to 2.2 THz, that enables analysis of penthrite and octogen, two important explosives.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 534-537
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmission Spectra of Materials in the Terahertz Range Measured by a Hot Electron Bolometer-Based System
    Autorzy:
    Pałka, N.
    Walczakowski, M.
    Zagrajek, P.
    Czerwiński, A.
    Sypek, M.
    Szustakowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399395.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.57.Ty
    78.20.Ci
    78.40.-q
    78.47.jg
    Opis:
    This paper presents an optical system for transmission spectral measurements in the terahertz range. The source of radiation is a tunable solid-state laser, which generates a narrow-band nanosecond pulses in the range 0.67-2.68 THz and based on optical parametric oscillator phenomenon. The signal is detected with a fast and sensitive hot electron bolometer. Principle of generation and detection of pulses as well as methodology of measuring spectral characteristics are presented. We compared the results obtained with the free-space setup, which is based on the optical parametric oscillator and hot electron bolometer, with a purged time domain spectroscopy system in the range of 0.7-2.2 THz.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 538-541
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperspectral Imaging Infrared Sensor Used for Enviromental Monitoring
    Autorzy:
    Kastek, M.
    Piatkowski, T.
    Zyczkowski, M.
    Chamberland, M.
    Lagueux, P.
    Farley, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399366.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.57.Ty
    78.20.Ci
    78.40.-q
    78.47.jg
    Opis:
    This paper presents detection, identification and quantification of gases using an infrared imaging Fourier-transform spectrometer. The company Telops has developed an imaging Fourier-transform spectrometer instrument, Hyper-Cam sensor, which is offered as short or long wave infrared sensor. The principle of operation of the spectrometer and the methodology for gases detection, identification and quantification has been shown in the paper, as well as theoretical evaluation of gases detection possibility. The variation of a signal reaching the imaging Fourier-transform spectrometer caused by the presence of a gas has been calculated and compared with the reference signal obtained without the presence of a gas in the imaging Fourier-transform spectrometer field of view. Some result of the detection of various types of gases has been also included in the paper.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 463-467
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Band Structure and Optical Properties οf the Layered $Hg_{3}TeCl_{4}$ Crystal
    Autorzy:
    Sznajder, M.
    Bercha, D.
    Potera, P.
    Khachapuridze, A.
    Panko, V.
    Bercha, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791361.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.-e
    78.40.-q
    78.55.-m
    71.20.-b
    Opis:
    First experimental investigations on absorption and photoluminescence of the novel $Hg_{3}TeCl_{4}$ monocrystals grown by the Bridgman method are reported. A comparison of the measurement results with theoretical band structure calculations of the $Hg_{3}TeCl_{4}$ crystal confirmed that $Hg_{3}TeCl_{4}$ is a wide-band-gap photoconductor ($E_{g}$ = 3.64 eV at 24 K) with the effective masses of charge carriers characteristic for semiconductors. Energetic position of the main photoluminescence peak and its temperature dependence indicates the presence of an additional energy level in the energy gap which takes part in the radiative recombination process and whose origin was discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 950-951
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy Level Scheme of Nd$\text{}^{3+}$ Ion in Rare Earth Oxyhalides, REOX (X = F, Cl, and Br)
    Autorzy:
    Beaury, L.
    Hölsä, J.
    Korventausta, J.
    Krupa, J.-C.
    Lamminmäki, R.-J.
    Porcher, P.
    Rahiala, H.
    Säilynoja, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952823.pdf
    Data publikacji:
    1996-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    71.70.Ch
    78.40.-q
    78.55.-m
    Opis:
    The energy level schemes of the neodymium oxyhalides (NdOX, X = F, Cl, and Br) were studied and simulated with a phenomenological model accounting simultaneously for both the free ion interactions and the crystal field effect. The former included the electrostatic and interconfigurational interactions as well as the spin-orbit coupling. The simulations were carried out by using the data from the optical absorption and luminescence as well as the inelastic neutron scattering measured at low temperatures between 2.5 and 77 K. The values of the Slater integral F$\text{}^{2}$ describing the electrostatic interactions decrease while F$\text{}^{4}$ and F$\text{}^{6}$ increase as a function of the ionic radius of the halide anion. The strength of the spin-orbit coupling is quite the same in all three matrices. The crystal field effect - measured as the crystal field strength parameter S - is almost twice as strong in the hexagonal NdOF matrix (650 cm$\text{}^{-1}$) than in the tetragonal NdOCI or NdOBr (367 and 378 cm$\text{}^{-1}$, respectively). Similar evolution was obtained for the short-and mid-range crystal field strengths related to the spatial extension of the interaction.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 6; 1203-1213
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czochralski Growth and Optical Properties οf $(Lu_{x}Gd_{1-x})_2SiO_5$ Solid Solution Crystals Single Doped with $Sm^{3+}$ and $~Dy^{3+}$
    Autorzy:
    Ryba-Romanowski, W.
    Strzęp, A.
    Głowacki, M.
    Lisiecki, R.
    Solarz, P.
    Domagala, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399472.pdf
    Data publikacji:
    2013-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Rz
    42.70.Hj
    78.40.-q
    78.55.Fv
    Opis:
    Solid solution crystals $(Lu_{x}Gd_{1-x})_2SiO_5$ single doped with $Sm^{3+}$ and $Dy^{3+}$ were grown by the Czochralski method. Segregation coefficients Lu/Gd, melting temperatures and structures of solid solution crystals were determined for 0.15 ≤ x ≤ 0.8. It was found that for x ≥ 0.17 the crystals belong to the monoclinic system within a space group C2/c and their melting temperature diminishes monotonously from 1990C to 1780C when x decreases from 0.8 to 0.15. Disparity of ionic radii of $Lu^{3+}$ and $Gd^{3+}$ induces structural disorder that brings about an inhomogeneous broadening of spectral lines in absorption and emission spectra of incorporated luminescent $Sm^{3+}$ and $Dy^{3+}$ ions. Optical properties of obtained crystals were determined based on results of measurement of absorption and emission spectra and luminescence decay curves. Spectroscopic investigation revealed that $Sm^{3+}$ doped crystals show intense emission distributed in the visible-near infrared region with the most intense band centred at 605 nm and characterized by a branching ratio of 0.43. Emission spectrum of $Dy^{3+}$ doped crystals is dominated by a band centred at 575 nm and characterized by a branching ratio of 0.58. It has been concluded that the systems under study are potential laser materials able to generate visible emission upon GaN/InGaN laser diode pumping.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 2; 321-328
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Complex THz Reflectance Spectra of Hexogen Measured for Various Surfaces
    Autorzy:
    Palka, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418028.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.57.Ty
    78.20.Ci
    78.40.Pg
    78.40.-q
    78.47.jg
    Opis:
    In this paper, we report on measurements of reflection spectra of hexogen (RDX) by means of time domain spectroscopy. We analyzed both phase and amplitude of reflected impulses for three cases: detuning, samples with rough surfaces and samples with curved surfaces. It can be concluded that both spectral characteristics can be applied for identification of explosives in the reflection configuration.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 854-857
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mesure de la Temperature Basees sur l'Observation du Premier Systéme Negatif de l'Azote
    Temperature Measurements Based on the First Negative Spectrum of Nitrogen
    Autorzy:
    Nassar, H.
    Czernichowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929529.pdf
    Data publikacji:
    1993-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.10.-n
    33.20.-t
    07.20.Ka
    78.40.-q
    Opis:
    Noisy, non-resolved emission spectra of the (0,0) 391.4 nm N$\text{}_{2}$$\text{}^{+}$ molecular band are employed for the rotational (and in some case vibrational) temperature evaluation in different sources in the range of 320-7900 K when the apparatus function of the recording system is unknown. The following sources are examined: an ovoid-shaped transferred arc at atmospheric pressure, a low-pressure transferred arc, a high-voltage high-pressure electric discharge, a low-pressure radio-frequency discharge, and an atmospheric pressure laminar plasma jet. The described method is based on a normalization of the experimental spectrum with respect to the (0,0) band-head amplitude followed by a point-to-point comparison of the real spectrum with respect to a computer simulated spectrum using the best-square fit criterion. This criterion is found as the good one: the relative error on temperature evaluation had the same order of magnitude as the noise-to-signal ratio, even if the last one was relatively high. It was also found that the rotational and vibrational temperatures in the radio-frequency discharge are very different, which indicates an out of thermodynamic equilibrium characteristic of such a discharge. The proposed method of temperature evaluation is shown as quite precise and simple to use for even the non-spectroscopists.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 2; 215-228
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solvatochromic Effect in a Benzimidazole-Based Betaine: Determination of the Dipole Moments and Second-Order Hyperpolarizability
    Autorzy:
    Ziółek, L.
    Palewska, K.
    Lipiński, J.
    Sworakowski, J.
    Nes̆půrek, S.
    Böhm, S.
    Meister, E. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933559.pdf
    Data publikacji:
    1995-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Jk
    33.20.-t
    42.65.An
    78.40.-q
    Opis:
    Results of measurements of the solvent-dependent shift of the low-energy absorption band solvatochromic effect in a benzimidazole-based betaine are reported in the paper. Measurements of absorption spectra in several solvents of different polarities were performed. The solvatochromic shift of the low-lying absorption band was found to exceed 3000 cm$\text{}^{-1}$; the results obtained were then employed to calculate the ground- and excited-state dipole moment of the molecule. The spectroscopic measurements were supplemented by measurements of the ground-state dipole moment. A remarkable change in the charge distribution was found to occur upon the electronic excitation: both the experimental results and the calculations indicate that the ground-state dipole moment is close to 13 D, whereas in the excited state it amounts to ca. 3 D. The second-order hyperpolarizability of the molecule was calculated from the measurements; its off-resonance value amounts to ca. 20 × 10$\text{}^{-40}$ m$\text{}^{4}$/V (4.8 × 10$\text{}^{-30}$ esu), depending on the solvent used.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 2; 283-293
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some Optical Aspects of Thermally Evaporated Lead Oxide Thin Films
    Autorzy:
    Aly, S.
    Kaid, M.
    El-Sayed, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399301.pdf
    Data publikacji:
    2013-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.55.-g
    81.15.-z
    78.20.-e
    78.20.Ci
    78.40.-q
    Opis:
    The optical properties of lead oxide samples prepared using thermal evaporation technique on unheated glass substrates with different film thicknesses have been studied. The structural characteristics of a lead oxide sample was investigated using X-ray diffraction and it is confirmed to be in the amorphous state. The optical properties of the prepared films were studied by transmittance and reflectance measurements, and the integrated transmittance ($T_\text{UV}$, $T_\text{VIS}$ and $T_\text{Sol}$) in ultraviolet, visible and solar regions was calculated and found to be affected by film thickness. The dependence of absorption coefficient on wavelength was also reported. The energy gap was calculated and has been observed around 3.7 eV.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 4; 713-716
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, Characterization and Adsorptive Properties οf Organobentonites
    Autorzy:
    Jović-Jovičić, N.
    Milutinović-Nikolić, A.
    Banković, P.
    Dojčinović, B.
    Nedić, B.
    Gržetić, I.
    Jovanović, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538150.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Ea
    61.05.cp
    68.43.-h
    78.40.-q
    82.65.-r
    Opis:
    In this paper partial and complete substitution of cations in the interlayer region of clay with different amounts of two aliphatic ammonium cations was performed with aim of synthesis of organobentonites with multipurpose adsorption properties. Domestic clay from Bogovina was submitted according to a common procedure used for the obtention of organobentonite, which comprises the following steps: grinding, sieving, Na-exchange, cation exchange and drying. The samples were characterized by X-ray diffraction and infrared spectroscopy. The incorporation of surfactant molecules into smectite structure lead to constant increase of $d_{001}$ basal spacing. IR absorption bands assigned to methyl and methylene vibrations increased with the increase of surfactant/bentonite ratio and length of aliphatic chain in surfactant molecules. Adsorptive properties of the obtained materials were in accordance with their organophylicity: the adsorption of organic dye increased while the rate of removal of $Pb^{2+}$ by adsorption decreased.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 849-854
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Excited State Absorption and Thermoluminescence in Ce and Mg Doped Yttrium Aluminum Garnet
    Autorzy:
    Wiśniewski, K.
    Koepke, Cz.
    Wojtowicz, A. J.
    Drozdowski, W.
    Grinberg, M.
    Kaczmarek, S. M.
    Kisielewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2007834.pdf
    Data publikacji:
    1999-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Hx
    78.55.-m
    78.60.Kn
    73.50.Gr
    29.40.Mc
    78.20.-e
    78.20.Wc
    78.40.-q
    Opis:
    In this paper we report preliminary results of optical studies on Y$\text{}_{3}$Al$\text{}_{5}$O$\text{}_{12}$ (YAG) crystals codoped with Ce and Mg. By using measurements of luminescence, absorption, and luminescence excitation spectra we demonstrate that although the basic features introduced to the YAG host by the Ce-doping remain intact, the Mg-codoping imposes some significant changes on other properties of the material. These changes are potentially important for laser and/or scintillator applications of YAG:Ce and are due, most likely, to modifications of defect populations in the material. We characterize them by using the techniques of thermoluminescence and excited state absorption under excimer laser pumping. These techniques, interestingly, yield results that seem inconsistent. While the thermoluminescence signal of the Mg-doped sample is strongly reduced, suggesting that trap concentrations in the presence of Mg are suppressed, the excited state absorption signal, which we also relate to the traps, is higher. We offer a tentative explanation of this contradiction between the two experiments that involves a massive transfer of electrons from the Mg-related defects to the excited state absorption centers caused by the excimer pump itself.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 3; 403-412
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrafast Phenomena in Freestanding LT-GaAs Devices
    Autorzy:
    Marso, M.
    Mikulics, M.
    Adam, R.
    Wu, S. Wu.
    Zheng, X.
    Camara, I.
    Siebe, F.
    Förster, A.
    Güsten, R.
    Kordoš, P.
    Sobolewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041640.pdf
    Data publikacji:
    2005-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Jv
    72.40.+w
    78.30.Fs
    85.60.-q
    85.60.Gz
    Opis:
    We report on the fabrication and high-frequency performance of our photodetectors and photomixers based on freestanding low-temperature-grown GaAs. The MBE-grown low-temperature GaAs layers are lifted from the native GaAs substrate and transferred on top of variety of host substrates. The freestanding devices exhibit breakdown electrical fields above 200 kV/cm and dark currents below 3×10$\text{}^{-7}$ A at 100 V bias. Device photoresponse shows 0.55 ps wide electrical transients with voltage amplitudes up to 1.3 V, measured using an electro-optical sampling technique with 100 fs wide laser pulses. Photomixing experiments at 460 GHz yield a 9 times higher output power for the freestanding device on Si/SiO$\text{}_{2}$ host substrate compared to the native substrate.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 1; 109-117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Annihilation in Steel Burnished by Vibratory Shot Peening
    Autorzy:
    Zaleski, R.
    Zaleski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047165.pdf
    Data publikacji:
    2006-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    71.60.+z
    62.20.Fe
    62.20.Mk
    81.20.Wk
    81.40.-z
    81.70.-q
    81.05.Bx
    Opis:
    A series of C45 steel samples was burnished by shot peening with varying time of treatment. The samples were investigated by nondestructive positron annihilation techniques: angular correlations of two-quantum annihilation radiation and positron annihilation lifetime spectroscopy. To determine residual stresses present under burnished surface the same samples were studied by destructive Davidenkov method. Change of absolute value of the weighted average of residual stresses over positron range in the series of the samples is in good agreement with change of S/W ratio obtained by angular correlations of two-quantum annihilation radiation. Both parameters increase during first 10 minutes of shot peening and then stabilize. Positron annihilation lifetime spectra allowed to identify two types of structural defects: smaller ones like vacancies or dislocations and bigger - probably clusters of vacancies. Increase in shot peening time causes reduction of positron trapping rate and lifetime rise in bigger defects.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 5; 739-746
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-32 z 32

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