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Anharmonic line shift and linewidth of the Raman modes in TlInS 2 layered crystals
Author(s) -
Yuksek N. S.,
Gasanly N. M.,
Aydinli A.
Publication year - 2004
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1083
Subject(s) - anharmonicity , raman spectroscopy , phonon , laser linewidth , wavenumber , condensed matter physics , lattice (music) , thermal expansion , spectral line , chemistry , coupling (piping) , line (geometry) , molecular vibration , crystal (programming language) , molecular physics , materials science , physics , optics , quantum mechanics , thermodynamics , programming language , laser , geometry , mathematics , computer science , acoustics , metallurgy
The temperature dependence of the unpolarized Raman spectra from TlInS 2 layered crystal was measured between 10 and 300 K. The analysis of the experimental data showed that the temperature dependences of wavenumbers and linewidths are well described by considering the contributions from thermal expansion and lattice anharmonicity. The purely anharmonic contribution (phonon–phonon coupling) was found to be due to three‐phonon processes. This work demonstrates that the two Raman modes at 280.9 and 292.3 cm −1 exhibit changes toward high wavenumbers as the temperature is raised from 10 to 300 K. Copyright © 2003 John Wiley & Sons, Ltd.