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High‐pressure Raman spectra of L ‐threonine crystal
Author(s) -
Silva B. L.,
Freire P. T. C.,
Melo F. E. A.,
Filho J. Mendes,
Pimenta M. A.,
Dantas M. S. S.
Publication year - 2000
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 - 10.1002/1097-4555(200006)31:6<519::aid-jrs567>3.0.co;2-x
Subject(s) - raman spectroscopy , chemistry , crystal (programming language) , diamond anvil cell , phase transition , spectral line , wavenumber , classification of discontinuities , crystallography , crystal structure , analytical chemistry (journal) , high pressure , condensed matter physics , optics , thermodynamics , physics , organic chemistry , mathematical analysis , mathematics , astronomy , computer science , programming language
Raman spectra of an L ‐threonine crystal were investigated as a function of pressure in a diamond anvil cell up to 43 kbar at room temperature. It was observed that the crystal undergoes a phase transition between 20.3 and 22.4 kbar. This transition is accompanied by changes in the external mode region of the spectra, by discontinuities of the curves of wavenumber vs pressure and by abrupt changes in the relative intensity of bands, especially those associated with hydrogen bonds. Pressure coefficients for the most intense bands are also given. Copyright © 2000 John Wiley & Sons, Ltd.