Abstract

Raman scattering has been used to investigate monohydrated L-asparagine single crystals for temperatures above 300 K in the spectral region between 20 and 3500 cm(-1). It is found that several phonon peaks characterizing the orthorhombic D-2(4) room temperature phase are notably suppressed in intensity for temperatures higher than similar to 363 K. This is evidence of a new phase in this hydrogen-bonded crystalline system, and the transition is compared with both the high-pressure and the low-temperature phase transitions undergone by the crystal. (c) 2006 Elsevier Ltd. All rights reserved.

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