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Disorder‐induced Raman scattering in non‐crystalline films of alkaline‐earth halides
Author(s) -
Harbach F.
Publication year - 1979
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.2220950122
Subject(s) - fluorite , raman spectroscopy , alkaline earth metal , ion , raman scattering , halide , depolarization ratio , phonon , lattice (music) , density functional theory , materials science , analytical chemistry (journal) , chemistry , mineralogy , condensed matter physics , inorganic chemistry , physics , optics , computational chemistry , alkali metal , organic chemistry , chromatography , acoustics , metallurgy
Above 50 cm −1 the Raman spectrum of quench‐condensed thin films of SrCl 2 , BaCl 2 , and BaFCl can be interpreted as a weighted one‐phonon density of states according to the theory of Shuker and Gammon. The weighting emphasizes those normal modes that are related to the Ramanactive F 2g mode of the chlorine ions in a fluorite lattice: The maximum of the weighted density of states of non‐crystalline SrCl 2 is situated at 180 cm −1 , of BaCl 2 , and BaFCl at 160 cm −1 . Above 50 cm −1 the depolarization ratio is approximately frequency independent and fluctuates around 0.5.