Two-Phonon Absorption Spectra in ϵ-GaSe
F. Lévy
Laboratoire de Physique Appliquée, École Polytechnique Fédérale de Lausanne
Search for more papers by this authorF. Lévy
Laboratoire de Physique Appliquée, École Polytechnique Fédérale de Lausanne
Search for more papers by this authorLinnéstraße 5, DDR-7010 Leipzig, DDR.
2, av. Ruchonnet, CH-1003 Lausanne, Switzerland.
Abstract
enPolarization-dependent optical transmission spectra of ϵ-GaSe are measured at room temperature in the wave number range from 180 to 600 cm−1. The absorption peaks observed can be interpreted in terms of two-phonon combination modes including Γ, A, and M point phonons. The M point phonon frequencies derived from the two-phonon absorption spectra are in good accordance with data previously published.
Abstract
dePolarisationsabhängige optische Transmissionsspektren von ϵ-GaSe werden bei Zimmertemperatur im Wellenzahlbereich von 180 bis 600 cm−1 gemessen. Die beobachteten Absorptionslinien können als Zwei-Phononen-Kombinationsmoden unter Einbeziehung von Phononen der Punkte Γ, A und M interpretiert werden. Die aus den Zwei-Phononen-Absorptionsspektren ermittelten Frequenzen für die Phononen am Punkt M stimmen gut mit früher veröffentlichten Daten überein.
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