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1.
With the help of group theory analysis of absorption spectra of the transition 3H6 → 3F3 of Tm3+ ion in TmAl3(BO3)4 crystal, measured at several temperatures from 1.8 till 293 K, it has been shown, that the local symmetry of the Tm3+ environment is C3 and it decreases to C1 at a low temperature. Effective selection rules and polarizations of lines at high enough temperatures (when the line-width is larger than the splitting in C3 symmetry) have been obtained. 相似文献
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V. S. Malakhovskii 《Journal of Mathematical Sciences》1983,21(2):127-151
In the survey there are reflected papers on the differential geometry of manifolds of figures reviewed in RZh “Matematika” in 1971–1979. 相似文献
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A.S. Aleksandrovsky A.S. Krylov A.V. Malakhovskii V.N. Voronov 《Journal of luminescence》2012,132(3):690-692
Low temperature luminescence spectrum of holmium ions in monoclinic Rb2KHoF6 crystal was found to be well analyzable by the comparison with earlier studied cubic Cs2NaHoF6. The manifestation of the local symmetry influence on the strength of individual lines is found to be distinctive. In the absence of structural data, the local symmetry of holmium in Rb2KHoF6 is proved to be a non-centrosymmetric one. The concentration quenching of holmium luminescence in Rb2KHoF6 is found to be rather modest. 相似文献
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Time evolution of mass distribution of argon cluster ions has been studied in pulsed jets (pulse duration≈0.4 ms) by retarding potential method. The ejection of cluster ions of the order of 180 atoms from cluster ions of the order of 500 atoms has been revealed. The ejection has a threshold character as a function of the time elapsed after electron impact ionization. The threshold time was about 20 μs. Delayed non-thermal fragmentation of the cluster ions testifies that the self-trapped ion, formed in argon clusters as a result of ionization, can live for a long time in its excited state without dissipation of the excess energy to the cluster. This ion should be located on the surface of the cluster. Energetic analysis of the fragmentation is consistent with the size of the ejected clusters. A model of the observed time evolution of the delayed fragmentation is herein proposed. 相似文献
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A.S. Aleksandrovsky A.V. Malakhovskii V.N. Zabluda A.I. Zaitsev A.V. Zamkov 《Journal of Physics and Chemistry of Solids》2006,67(8):1908-1912
Optical absorption, luminescence, magnetic circular dichroism and Faraday rotation spectra of Sr0.95Eu0.05B4O7 single crystals are studied. The crystal field parameter for europium ions is found to be equal to 790 cm−1. Excitation spectrum of luminescence strongly differs from that of low-doped polycrystalline strontium tetraborate. The Verdet constant in the ultraviolet is comparable to that of terbium gallium garnet in the visible. 相似文献
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A. V. Malakhovskii V. V. Sokolov A. L. Sukhachev A. S. Aleksandrovsky I. A. Gudim M. S. Molokeev 《Physics of the Solid State》2014,56(10):2056-2063
Single crystals of the ErFe3(BO3)4 borate were synthesized and their structure was studied. Absorption spectra of the Er3+ ion in σ- and π-polarizations of f-f transitions 4 I 15/2 → 4 I 13/2, 4 I 11/2, 4 I 9/2, 4 F 9/2, 4 S 3/2, 2 H 11/2, and 4 F 7/2 were measured. The refractive index and birefringence were measured as a function of the wavelength. The transition intensities were analyzed within the Judd-Ofelt theory, and the following parameters of the theory were obtained: Ω2 = 7.056 × 10?20 cm2, Ω4 = 1.886 × 10?20 cm2, and Ω6 = 2.238 × 10?20 cm2. Using these parameters, the radiative transition probabilities, luminescence branching ratios, and radiative lifetimes of multiplets were calculated. 相似文献
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A. V. Malakhovskii V. A. Isachenko A. L. Sukhachev A. M. Potseluyko V. N. Zabluda T. V. Zarubina I. S. Edelman 《Physics of the Solid State》2007,49(4):701-707
The temperature dependence of the absorption spectra and magnetic circular dichroism due to f-f transitions from the 6 H 15/2 to 6 F 5/2 and 6(F 7/2 + H 5/2) states in the Dy3+ ion in (Dy2O3-P2O5-SiO2-GeO2) and (Dy2O3-La2O3-Al2O3-B2O3-SiO2-GeO2) glasses and the temperature dependence of the Faraday effect were studied. The temperature dependence of the Faraday effect caused by f-d transitions was found to differ from that of the magnetic circular dichroism due to f-f transitions. It was shown that f-f transitions occur preferentially in Dy3+ ions associated into clusters. The origin of the paramagnetic magneto-optical activity of f-f transitions was analyzed. It was shown that the contributions to this activity can differ in value and sign and that the ratio between these contributions depends on the transition type. In some cases, this difference results in an anomalous temperature dependence of the magneto-optical activity. 相似文献
10.
A. V. Malakhovskii S. L. Gnatchenko I. S. Kachur V. G. Piryatinskaya A. L. Sukhachev A. E. Sokolov A. Ya. Strokova A. V. Kartashev V. L. Temerov 《Crystallography Reports》2013,58(1):135-138
Optical absorption spectra of YbAl3(BO3)4, TmAl3(BO3)4 and TbFe3(BO3)4 trigonal crystals have been studied in temperature range 2–300 K. Temperature behavior of absorption lines parameters has shown, that during some f-f transitions the local environment of rare earth ions undergo distortions, which are absent in the ground state. 相似文献