Abstract
Information about the strength of the hydrogen bond interactions in
crystalline L-valine was obtained by Raman and inelastic neutron
scattering spectroscopies. Raman studies were carried out from room
temperature up to 423 K in order to examine both the external and the
internal vibrations in L-valine. The structure seems to be stable above
room temperature since no indication of a phase transition or clear
indication of reorientation of L-valine molecules was observed. From the
inelastic neutron scattering measurements, made between 270 and 320 K,
for fully hydrogenated and partially deuterated L-valine, a better
description of the low frequency modes was possible. Moreover it was
possible to establish that the phase transition at low temperatures is
related to the activation of an infrared mode in the Raman spectra.
Additionally the low temperature phase of L-valine was further
characterized by means of specific heat measurements between 5 and 350
K.
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