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Two‐Phonon Combination Mode Spectra of AgGaS 2
Author(s) -
Neumann H.,
Sobotta H.,
Moise E.,
Treser E.,
Krämer V.
Publication year - 1993
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170280425
Subject(s) - phonon , spectral line , raman spectroscopy , wavenumber , range (aeronautics) , materials science , absorption spectroscopy , absorption (acoustics) , molecular physics , optics , analytical chemistry (journal) , chemistry , condensed matter physics , physics , chromatography , astronomy , composite material
Absorption spectra of (001)‐oriented AgGaS 2 single crystals are measured in the wavenumber range from 400 to 900 cm −1 . The spectra exhibit 12 structures due to two‐phonon combination modes which can be all interpreted as sum modes of zone‐centre phonons. Possible frequencies for the B 1 and A 2 modes are discussed. The results obtained are compared with second‐order Raman spectra of the compound.