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Vibrational Spectra of TlGaTe 2 , TlInTe 2 , and TlInSe 2 Layer Single Crystals
Author(s) -
Gasanly N. M.,
Goncharov A. F.,
Dzhavadov B. M.,
Melnik N. N.,
Tagirov V. I.,
Vinogradov E. A.
Publication year - 1980
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.2220970142
Subject(s) - raman spectroscopy , raman scattering , reflection (computer programming) , spectral line , molecular vibration , lattice vibration , lattice (music) , infrared , force constant , chemistry , crystal (programming language) , materials science , molecular physics , analytical chemistry (journal) , optics , phonon , condensed matter physics , physics , molecule , astronomy , computer science , acoustics , programming language , organic chemistry , chromatography
Polarized IR‐reflection and Raman scattering spectra are obtained for TlGaTe 2 , TlInTe 2 , and TlInSe 2 crystals (space group D 4h 18 ). The IR‐reflection spectra of all the crystals show the presence of two ( E ‖ c ) and three ( E ⟂ c ) modes, which is in full agreement with the prediction of a group‐theoretical analysis. All seven Raman active modes are detected in TlInSe 2 . In TlGaTe 2 and in TlInTe 2 only three of seven Raman active modes can be observed. Normal coordinates, effective force constants, and effective charges are determined for the infra‐red active lattice vibrations.