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Low‐Wavenumber Raman Scattering of Molecular Glass‐Forming Liquids
Author(s) -
AlbaSimionesco C.,
Krakoviack V.,
Krauzman M.,
Migliardo P.,
Romain F.
Publication year - 1996
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/(sici)1097-4555(199610)27:10<715::aid-jrs32>3.0.co;2-6
Subject(s) - wavenumber , supercooling , raman spectroscopy , glass transition , raman scattering , molecular physics , molecular dynamics , dipole , melting point , chemistry , relaxation (psychology) , spectral line , materials science , chemical physics , thermodynamics , optics , computational chemistry , physics , organic chemistry , quantum mechanics , psychology , social psychology , polymer
In connection with the liquid to glass transition, much attention has been given to the relaxation dynamics of dense fluids; in particular, Raman spectroscopy has been employed to study fast dynamic processes. Depolarized light scattering spectra are presented of several glass‐forming molecular liquids, a series of disubstituted benzenes and glycerol, in their supercooled regime (at temperatures below the melting point) in the wavenumber range from 5 to 200 cm −1 . Some common features are encountered which combine two contributions, vibrational and relaxational; in the framework of the dipole‐induced‐dipole formalism, schematic mode coupling equations are adjusted to the experimental susceptibilities, and the shape of the spectra, including the so‐called ‘boson peak,’ is analysed in terms of damped oscillators.