Author/Authors :
Bento، نويسنده , , I.C.V. and Freire، نويسنده , , P.T.C. and Melo، نويسنده , , F.E.A. and Mendes Filho، نويسنده , , J. and Moreno، نويسنده , , A.J.D. and Joya، نويسنده , , M.R. and Pizani، نويسنده , , P.S.، نويسنده ,
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 ∼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.
