论文信息 - Isotopic Impurity Modes and Polariton Dispersion in Li2GeO3 Crystals

Isotopic Impurity Modes and Polariton Dispersion in Li2GeO3 Crystals

Infrared reflection and Raman spectra of single crystals of 7Li2GeO3 and 6Li2GeO3 containing 7.42 and 9.10% of 6Li and 7Li, respectively, are measured and the oscillator parameters LO, TO, γLO, and γTO 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.

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