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Pressure and temperature dependence of the vibrational excitations of crystalline iodoform
Author(s) -
Medina J.,
Sherman W. F.,
Wilkinson G. R.
Publication year - 1982
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.1250120109
Subject(s) - raman spectroscopy , intermolecular force , infrared , hydrostatic pressure , iodoform , chemistry , infrared spectroscopy , molecular vibration , atmospheric temperature range , hydrostatic equilibrium , analytical chemistry (journal) , absorption (acoustics) , spectral line , molecular physics , materials science , optics , thermodynamics , molecule , organic chemistry , physics , quantum mechanics , astronomy , composite material
Raman spectra of single crystals of iodoform have been investigated over the temperature range 10–300 K and under hydrostatic pressure up to 14 kbar. The pressure‐induced shifts in vibrational frequency of many different modes have been used to calculate their respective Gruneisen parameters γ which are found to vary both with the frequency and pressure. They are much greater for the intermolecular modes than for the internal modes. The infrared absorption spectra have also been observed at different temperatures and are used together with the Raman data to obtain dν/d T for each band. Some new infrared assignments are suggested.