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Isotopic Impurity Modes and Polariton Dispersion in Li 2 GeO 3 Crystals
Author(s) -
Orel B.,
Klanjšek M.,
Moiseenko V.,
Volnyanskii M.,
Le Calvé N.,
Pasquier B.,
Novak A.
Publication year - 1985
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221280107
Subject(s) - polariton , reflection (computer programming) , impurity , raman spectroscopy , dispersion (optics) , dispersion relation , phonon , resonance (particle physics) , spectral line , physics , chemistry , condensed matter physics , analytical chemistry (journal) , atomic physics , optics , quantum mechanics , chromatography , computer science , programming language
Infrared reflection and Raman spectra of single crystals of 7 Li 2 GeO 3 and 6 Li 2 GeO 3 containing 7.42 and 9.10% of 6 Li and 7 Li, respectively, are measured and the oscillator parameters \documentclass{article}\pagestyle{empty}\begin{document}$ \tilde \nu $\end{document} LO , \documentclass{article}\pagestyle{empty}\begin{document}$ \tilde \nu $\end{document} TO , γ LO , and γ TO determined using the Kurosawa dispersion relation. The experimental attenuated total reflection spectra are in good agreement with the calculated polariton dispersion curves. The resonance type interactions between parent and isotopic impurity deformation modes are interpreted; the behaviour of the corresponding phonons depends on their symmetry species.