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    Wyświetlanie 1-14 z 14
    Tytuł:
    Reflectivity Spectra of Cd$\text{}_{1-x}$Mn$\text{}_{x}$F$\text{}_{2}$ in the 5-35 eV Energy Range
    Autorzy:
    Francini, R.
    Zimnal-Starnawska, M.
    Zema, N.
    Orłowski, B. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1891370.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Ha
    Opis:
    The reflectivity spectra of Cd$\text{}_{1-x}$Mn$\text{}_{x}$F$\text{}_{2}$ crystals, in the 5-35 eV energy range at 300 and 77 K, were investigated. The observed changes in the shape of spectra, caused by increase of the Mn content, are compared with the calculated band structure of pure CdF$\text{}_{2}$ and with the already available results of XPS experiments for these crystals. The increasing concentration of Mn results in the blurring of the reflectivity structures and shifts the energy of direct exciton (as compared to pure CdF$\text{}_{2}$). Qualitative arguments (hybridization of Mn$\text{}^{2+}$ 3d and F$\text{}^{-}$ 2p states) can describe these effects but a quantitative explanation would require a detailed band structure calculation for these compounds.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 453-456
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Absorption of Polymer Films Doped with BEDT-TTF Polyiodides
    Autorzy:
    Helberg, H. W.
    Staerk, D.
    Ulański, J.
    Jeszka, J. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933405.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Ha
    78.30.Jw
    74.70.Kn
    Opis:
    Conducting reticulate doped polymeric films containing BEDT-TTF iodide crystalline network were annealed in order to transform the crystallites into crystal phases with metallic conductivity. Measured optical absorption spectra show that annealing shifts the absorption band to higher frequencies and increases the transparency of the films. This behavior corresponds to the transformation of the α-phase into the superconducting α$\text{}_{t}$-phase observed in (BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ single crystals.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 893-897
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Color Centers in $Ca_4GdO(BO_3)_3$ Single Crystals Irradiated by Gamma Quanta
    Autorzy:
    Potera, P.
    Lukasiewicz, T.
    Piecuch, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400491.pdf
    Data publikacji:
    2013-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Fy
    78.40.Ha
    61.80.-x
    78.20.-e
    Opis:
    The present work is devoted to investigation of optical absorption in pure $Ca_4GdO(BO_3)_3$ single crystals in the spectral range 0.2-1.1 μm induced under influence of the gamma quanta irradiation with absorbed dose $2 \times 10^3$ Gy. The effect of heating in air on the absorption spectrum of irradiated sample is also studied.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 1; 122-124
    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:
    Spectroscopic and Laser Properties of LiNbO$\text{}_{3}$:Dy$\text{}^{3+}$ Crystals
    Autorzy:
    Malinowski, M.
    Myziak, P.
    Piramidowicz, R.
    Pracka, I.
    Łukasiewicz, T.
    Surma, B.
    Kaczmarek, S.
    Kopczyński, K.
    Mierczyk, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945542.pdf
    Data publikacji:
    1996-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Ht
    78.40.Ha
    78.47.+p
    78.55.Hx
    Opis:
    The spectroscopic properties of trivalent dysprosium (Dy$\text{}^{3+}$) doped LiNbO$\text{}_{3}$ crystals have been investigated at various temperatures. Absorption, emission, excitation and lifetime measurements have been performed and discussed in the framework of Judd-Ofelt approach. The stimulated emission cross sections of the strongest transitions of Dy $\text{}^{3+}$ ion have been estimated. A stimulated emission has been demonstrated in the near infrared.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 1; 181-189
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Spectroscopy of the $Nd^{3+}$ Luminescence Centres in the $Sr_{4}B_{14}O_{25}:Nd$ Crystal
    Autorzy:
    Padlyak, B.
    Ryba-Romanowski, W.
    Lisiecki, R.
    Oseledchik, Yu.
    Prosvirnin, A.
    Kudryavtcev, D.
    Svitanko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550132.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.-a
    78.40.Ha
    78.55.Hx
    78.20.Bh
    Opis:
    Optical absorption, emission and luminescence kinetics of $Nd^{3+}$ centres in the new borate crystal with $Sr_{4}B_{14}O_{25}:Nd$ (Nd content 0.2 wt.%) composition are investigated and analysed. The oscillator strengths ($P_\text{theor}$ and $P_\text{exp}$) for observed absorption transitions and phenomenological intensity parameters $Ω_t$ ($Ω_2$=1.59×$10^{-20} cm^{-1}$, $Ω_{4}$ = 2.06 × $10^{-20} cm^{-1}$, and $Ω_{6}$ = 2.28 × $10^{-20} cm^{-1}$ were calculated based on the standard Judd-Ofelt theory. Using $Ω_t$ parameters the radiative transitions rates $(W_{r})$, branching ratios (β) and radiative lifetime $(τ_{rad})$ for $Nd^{3+}$ centres in the $Sr_{4}B_{14}O_{25}:Nd$ crystal were calculated and analysed. Measured lifetime ($τ_{exp}$ = 105 and 93 μs at T = 10 and 300 K, respectively) is compared with this calculated ($τ_{rad}$ = 331 μs) and quantum efficiency for $Nd^{3+}$ centres from $\text{}^{4}F_{3//2}$ emitting level in the $Sr_{4}B_{14}O_{25}:Nd$ crystal is estimated (η ≅ 30%). Incorporation peculiarities and local structure of $Nd^{3+}$ luminescence centres in the $Sr_{4}B_{14}O_{25}$ crystal and corresponding glass with $4SrO-7B_{2}O_{3}$ composition are discussed on the basis of referenced X-ray diffraction data and presented results.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 104-110
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation Effects in DMAAS:Cr Ferroelectric Crystal
    Autorzy:
    Kapustianik, V.
    Czapla, Z.
    Eliyachevskyy, Yu.
    Korchak, Yu.
    Kulyk, B.
    Rudyk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037039.pdf
    Data publikacji:
    2003-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Ha
    64.70.Kb
    77.84.-s
    78.30.Hv
    Opis:
    This paper presents the results of investigations of the radiation effects in NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$×6H$\text{}_{2}$O crystals doped with chromium. On the basis of absorption spectroscopy and resonance Raman scattering study it has been shown that comparatively low doses of radiation first of all causes recharging of Cr$\text{}^{3+}$ on Cr$\text{}^{4+}$ ions. Besides, the processes of dehydrogenation and the changes in arrangement of the hydrogen bond network were observed. These changes are followed by distortion of the complexes bonded by such a type of bonds.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 6; 571-580
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A unified calculation of the optical and EPR spectral data for the trigonal Cr³⁺ center in Cr³⁺-doped α-RbAl(SO₄)₂·12H₂O alum crystal
    Autorzy:
    Li, Xiao-Wu
    Mei, Yang
    Wei, Cheng-Fu
    Zheng, Wen-Chen
    Powiązania:
    https://bibliotekanauki.pl/articles/1070555.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.70.Ch
    76.30.Fc
    78.40.Ha
    78.55.Hx
    Opis:
    The optical band positions and the spin-Hamiltonian parameters (g factors g_{∥}, g_{⊥}, and zero-field splitting parameter D) of alum α-RbAl(SO₄)₂·12H₂O:Cr³⁺ are calculated by diagonalizing the 120× 120 complete energy matrix based on the two-spin-orbit-coupling-parameter model. The model takes into account not only the contributions due to the spin-orbit-coupling parameter of central d^{n} ion in the conventional crystal field theory, but also those due to ligands via covalence effect. The calculation indicates that the fourteen observed spectral data (eleven optical band positions and three spin-Hamiltonian parameters) can be reasonably and uniformly explained with four adjustable parameters (the Racah parameters B, C, intrinsic parameter A̅₄(R) in the superposition model, and the trigonal distortion angle β). The calculations also suggest that contrary to the previous findings, the trigonal distortion of Cr³⁺ (entering the Al³⁺ site in the host crystal) center in α-RbAl(SO₄)₂·12H₂O is induced mainly by the oxygen (or water) octahedron around the Cr³⁺ ion rather than the more distant neighbors.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 340-343
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermochromic Effect in Doped Bi₁₂SiO₂₀ Crystals
    Autorzy:
    Diachenko, A.
    Panchenko, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029025.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Hw
    42.70.Nq
    78.20.Ci
    78.20.nb
    78.40.Fy
    78.40.Ha
    Opis:
    Optical-temperature investigations of stationary and photo-induced absorption in undoped and Al (or Ga) doped Bi₁₂SiO₂₀ crystals are discussed. In the wave-number range 22000-4000 cm¯¹ under temperatures from 80 to 650 K, peculiarities of thermochromic effect have been revealed and temperature dependences of intensity of bands forming photo- and thermochromic effects have been found. A correlation between these dependences and spectra of thermostimulated current is explained.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 936-939
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Optical Characterisation of Hydrogenated Soda-Lime Silicate Glasses Doped with Silver and Copper
    Autorzy:
    Suszyńska, M.
    Krajczyk, L.
    Macalik, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037038.pdf
    Data publikacji:
    2003-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Fs
    64.75.+g
    68.37.Lp
    78.20.-e
    78.40.Ha
    Opis:
    The results of comparative studies of the effect of hydrogenation upon structural and optical properties of the commercial soda-lime silicate glasses doped either with monovalent silver or copper have been presented. The samples were characterised by means of the scanning and transmission electron microscopy and the UV-VIS-IR absorption spectroscopy. It has been shown that the annealing of suitably ion-exchanged specimens in gaseous hydrogen atmosphere could be considered as an effective procedure for obtaining composite materials of expected properties correlated with the induced changes of the morphology of both the glassy matrix and the dopant.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 6; 559-569
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical in situ Study of Reduction/Oxidation Processes in Cr,Mg:YAG Epitaxial Film
    Autorzy:
    Buryy, O.
    Ubizskii, S.
    Syvorotka, I.
    Becker, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550540.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Cc
    66.30.Dn
    66.30.hd
    78.30.Hv
    78.40.Ha
    Opis:
    The changes of the optical absorption spectra of Cr,Mg:YAG epitaxial film caused by high-temperature redox treatment are investigated by means of in situ spectroscopy. The spectra were registered in the visible and near-IR spectral regions at temperatures up to 1100 K. The kinetics of optical absorption changing were obtained in the temperature range from 936 K to 1091 K and were described by mathematical model connecting the chromium recharging process with oxygen vacancies diffusion. The parameters of the model were determined from the approximations of the experimental kinetics.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 184-188
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution of $Pb^{2+}$ Ions in $PbF_{2}$-Doped $CaF_{2}$ Crystals
    Autorzy:
    Paraschiva, M.
    Nicoara, I.
    Stef, M.
    Bunoiu, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538667.pdf
    Data publikacji:
    2010-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Hj
    68.35.Dv
    78.20.Ci
    78.40.Ha
    81.10.Fq
    Opis:
    Calcium fluoride crystals doped with various concentrations of $PbF_{2}$ have been grown using the Bridgman technique. The optical absorption spectra reveal the characteristic UV absorption bands of the $Pb^{2+}$ ions. The distribution of the $Pb^{2+}$-ions along four crystals has been investigated using the optical absorption method. Taking into account the relationship between the optical absorption coefficient and the concentration of the impurities in the samples, the effective segregation coefficient of the $Pb^{2+}$ ions has been calculated. Our study shows that the effective segregation coefficient of the $Pb^{2+}$ ions in $CaF_{2}$ host depends on the dopant concentration, and varies between 0.85 and 1.15, for 0.5 mol%$PbF_{2}$ and 3 mol%$PbF_{2}$-doped $CaF_{2}$, respectively.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 3; 466-470
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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