Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "78.40.Ha" wg kryterium: Temat


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

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies