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Raman spectroscopy of BeO at low temperatures
Author(s) -
Devanarayanan S.,
Morell G.,
Katiyar R. S.
Publication year - 1991
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.1250220602
Subject(s) - phonon , raman spectroscopy , raman scattering , analytical chemistry (journal) , crystal (programming language) , spectroscopy , chemistry , dipole , nuclear magnetic resonance , molecular physics , materials science , atomic physics , condensed matter physics , optics , physics , organic chemistry , chromatography , quantum mechanics , computer science , programming language
Polarized first‐order Raman spectra of BeO crystal were recorded at various temperatures to study the variations in frequencies and intensities associated with some of the phonons. At 35 K five modes were assigned to be fundamentals at 338.1 682.6, 726.7 and 1085.8 cm −1 . The different scattering geometries were utilized to study the directional dependence of the dipolar phonons. Two peaks at 703.6 and 1093.7 cm −1 . were the quasi‐TO and LO modes, respectively. Both the frequency and the intensity of the phonons increase with decreasing temperature. The mode at 682.6 cm −1 was examined in more detail at several temperatures.