High-pressure Raman study of L-alanine crystal

Details High-pressure Raman study of L-alanine crystal High-pressure Raman study of L-alanine crystal

2000-01-14

arxiv.org/abs/cond-mat/0001212v1

Physics

Condensed Matter

Materials Science

11 pages, Latex, 2 figures

Scientific paper

10.1016/S0038-1098(00)00342-2

Pressure-dependent Raman scattering studies in the range 0.0 -- 32 kbar were carried out in L-alanine in order to investigate its external mode phonon spectra in relation to the phase transitions in the crystal. A careful analysis of the spectra shows that the low-energy Raman modes exhibit variation both in frequency and in intensity and between 26 and 28 kbar it is observed a splitting of a external mode, indicating that the D_2 normal phase undergoes a transition. Pressure coefficients for external modes are also given.

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