Anharmonicity Effects in IR-Reflection Spectra of Sheelites

Reflection spectra of PbWO4 crystals vs. the temperature are studied over the 700 to 1000 cm−1 frequency region. On the basis of an invertibility criterion of the oscillator obtained in the present paper, the anomaly in the reststrahlen band in the reflection spectrum is found to be connected with a...

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Veröffentlicht in:	Physica status solidi. B. Basic research 1984-09, Vol.125 (1), p.75-79
Hauptverfasser:	Efendiev, Sh. M., Nagiev, V. M., Burlakov, V. M.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology Infrared and raman spectra and scattering Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Physics
Online-Zugang:	Volltext
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Zusammenfassung:	Reflection spectra of PbWO4 crystals vs. the temperature are studied over the 700 to 1000 cm−1 frequency region. On the basis of an invertibility criterion of the oscillator obtained in the present paper, the anomaly in the reststrahlen band in the reflection spectrum is found to be connected with a strong frequency dependence of the damping Γ(Ω) of the transverse optical vibration. A possible decay channel for an intramolecular excitation corresponding to the peak of the function Γ(Ω) is proposed. [Russian Text Ignored].
ISSN:	0370-1972 1521-3951
DOI:	10.1002/pssb.2221250106