Experimental and theoretical study of the crystal-field levels and hyperfine and electron-phonon interactions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LiYF</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Er</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></m

Попова, М. Н.; Чукалина, Е. П.; Малкин, Б. З.; Saikin, Semion K.

doi:10.1103/physrevb.61.7421

Cited by 86 publications

(62 citation statements)

References 19 publications

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“…where n(ω) is the phonon occupation number, and g αβ (ss ′ |ω) are spectral representations of the Green's functions for differences between the ion displacements [24]. We performed a calculation of the relaxation [11].…”

Section: Relaxation Broadening Of the Crystal Field Levelsmentioning

confidence: 99%

High-resolution infrared absorption spectra, crystal-field levels, and relaxation processes inCsCdBr3:Pr3+

et al. 2001

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High resolution low-temperature absorption spectra of 0.2 % Pr 3+ doped CsCdBr3 were measured in the spectral region 2000-7000 cm −1 . Positions and widths of the crystal field levels within the 3 H5, 3 H4, 3 F2, and 3 F3 multiplets of the Pr 3+ main center have been determined. Hyperfine structure of several spectral lines has been found. Crystal field calculations were carried out in the framework of the semiphenomenological exchange charge model (ECM). Parameters of the ECM were determined by fitting to the measured total splittings of the 3 H4 and 3 H6 multiplets and to the observed in this work hyperfine splittings of the crystal field levels. One-and two-phonon relaxation rates were calculated using the phonon Green's functions of the perfect (CsCdBr3) and locally perturbed (impurity dimer centers in CsCdBr3:Pr 3+ ) crystal lattice. Comparison with the measured linewidths confirmed an essential redistribution of the phonon density of states in CsCdBr3 crystals doped with rare-earth ions.

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Section: Relaxation Broadening Of the Crystal Field Levelsmentioning

confidence: 99%

High-resolution infrared absorption spectra, crystal-field levels, and relaxation processes inCsCdBr3:Pr3+

et al. 2001

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“…[37][38][39][40] 3. Short description of the studied crystals structures, whereas the remaining one (Co(OH) 2 )) has a trigonal structure.…”

Section: Exchange Charge Modelmentioning

confidence: 99%

Semi-ab initio calculations of superposition model and crystal field parameters for Co2+ ions using the exchange charge model

Brik

Yeung

2008

Journal of Physics and Chemistry of Solids

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“…). The calculation of the shapes and the positions of these bands was carried out in a realistic model of the crystal field taking into account both the electrostatic field of point charges of lattice ions and the exchange charge field [26] allowing for the covalency effects in the binding of the metal ions to the oxygens in the nearest coordination sphere. Depending upon time on gas flux and temperature the nearest oxygen surrounding of a metal ion (M) in the Keggin unit may be unimpaired (MO 6 ) or ill-defined.…”

Section: 4mentioning

confidence: 99%

“…The vibronic coupling constants and crystal field splittings determining the positions and the shapes of the charge transfer and d-d bands were calculated in the exchange charge model [26] of the crystal field. In the present paper on the basis of the established in [25] regularities a qualitative explanation of the temperature behaviour of the visible (Vis) and NIR parts of the absorption spectra of H 4-x Cs x PVMo 11 O 40 (x=0,2) will be given.…”

Section: Introductionmentioning

confidence: 99%

UV/Vis/near-IR spectroscopic characteristics of H4–xCsxPVMo11O40 (x = 0, 2) catalyst under different temperatures and gas atmospheres

Melsheimer

Kröhnert

Ahmad

et al. 2002

Phys. Chem. Chem. Phys.

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In order to understand the transformations of the Keggin-type H4-xCsxPVMo11 (x=0,2) compounds with rising temperature over long time stream of different gas athmospheres, in situ UV/Vis/near-IR spectroscopic studies were carried out. Diffuse reflectance spectra were recorded using an improved spectrometer and a suitable microreactor. Visible and near-IR peak intensities, peak positions and the band gap energies were determined from apparent absorption spectra. Propene, iso-propanol, water and the oxidation products were analyzed by GC. The experimental observed blue shift of the visible absorption band in the range of crystal water loss and the increase of the near -IR absorption were explained on the basis of quantum-mechanical calculations of the shapes and positions of the charge transfer and d-d bands arising from Mo 5+ -Mo 6+ and V 4+ -Mo 6+ pairs in intact and ill-defined fragments of the Keggin structure. It was concluded that with removal of crystal water during the action of He, He/H2O, propene, O2/propene and increasing temperature reduced species with protons located at the bridging oxygens promote a blue shift of the visible band, while a large number of ill-defined species form the near-IR part of the spectra in the temperature range 326 -600 K.

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Experimental and theoretical study of the crystal-field levels and hyperfine and electron-phonon interactions inLiYF4:Er3+

Cited by 86 publications

References 19 publications

High-resolution infrared absorption spectra, crystal-field levels, and relaxation processes inCsCdBr3:Pr3+

High-resolution infrared absorption spectra, crystal-field levels, and relaxation processes inCsCdBr3:Pr3+

Semi-ab initio calculations of superposition model and crystal field parameters for Co2+ ions using the exchange charge model

UV/Vis/near-IR spectroscopic characteristics of H4–xCsxPVMo11O40 (x = 0, 2) catalyst under different temperatures and gas atmospheres

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