Abstract
Polarized Raman spectra of monohydrated L-asparagine (C4N2O3H8.H2O) were
studied at temperatures ranging from 300 to 10 K. The wavenumbers of
most modes were found to increase linearly upon cooling, although some
bands showed an exponential behaviour, which is discussed in terms of
anharmonicities of vibrations associated with hydrogen bonds. Evidence
was found of a structural phase transition at low temperature by
analysis of the external mode region of the spectra. An x-ray
diffraction investigation confirmed the occurrence of a structural
change between 140 and 150 K. Copyright (C) 2004 John Wiley Sons, Ltd.
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