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An Interpretation of the “Anomalous” Changes in the Low‐Wavenumber Range of the Raman Spectra of L ‐Alanine Crystals
Author(s) -
Kolesov Boris A.,
Boldyreva Elena V.
Publication year - 2013
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201300294
Subject(s) - wavenumber , raman spectroscopy , intermolecular force , spectral line , chemistry , molecule , atmospheric temperature range , lattice (music) , hydrogen bond , normal mode , molecular vibration , molecular physics , crystallography , analytical chemistry (journal) , materials science , vibration , thermodynamics , optics , physics , organic chemistry , quantum mechanics , astronomy , acoustics
“Anomalous changes” in the temperature‐ and pressure‐ dependences of the intensities and wavenumbers of the two low‐wavenumber modes in Raman spectra of single‐crystals of L ‐alanine have been interpreted in terms of a change in relative contributions of stretching and deformational components into the intermolecular vibrational bands. The relative contributions of the two components into a lattice vibration result from a change of relative orientations of molecules linked by hydrogen bonds in a three‐dimensional network on variations of temperature or pressure.