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Raman Effect in Selenium–Tellurium Mixed Crystals
Author(s) -
Geick R.,
Steigmeier E. F.,
Auderset H.
Publication year - 1972
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.2220540226
Subject(s) - raman spectroscopy , tellurium , selenium , wavelength , lattice (music) , trigonal crystal system , infrared , materials science , multi mode optical fiber , optics , molecular physics , condensed matter physics , chemistry , crystal structure , physics , crystallography , optoelectronics , optical fiber , metallurgy , acoustics
The Raman effect in selenium–tellurium mixed crystals has been studied. Four first order Raman lines have been observed and associated with long wavelength lattice modes of the alloy system. The experimental results together with existing infrared data indicate that the long wavelength modes from three of the six optical branches in these trigonal crystals show “multimode behaviour” while the other three branches show “one mode behaviour”. All the experimental data are compared to and discussed in connection with an existing random‐element‐isodisplacement model calculation of the eigenfrequencies of the lattice modes as a function of composition. The calculated frequencies and the predictions of the model for the behaviour of the long wavelength lattice modes are in, at least, qualitative agreement with the experimental data.