Abstract
Raman spectroscopy was used to investigate the vibrational properties of
L-glutamic acid in the beta-form in a diamond-anvil cell up to pressures
of 21.5 GPa in the spectral region between 20 and 3270cm(-1). From the
analysis of the results it was observed that the crystal undergoes an
impressive series of phase transitions in this pressure range. The phase
transitions are accompanied by modifications in a number of modes and
discontinuities in the wavenumber versus pressure plots, as well as by
modifications in the bands associated to both rocking and stretching
modes of NH3+. Upon decompression to ambient pressure the original
spectra were recovered indicating that the phase transitions are
reversible. (C) 2011 Elsevier B.V. All rights reserved.
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