New pressure-induced phase transitions of l-threonine crystal: A Raman spectroscopic study
Résumé
L-threonine crystal was studied by Raman spectroscopy under pressure in the spectral range from 50 to
3300 cm1. The pressure range of a previous study has been extended from 4 to 27.0 GPa. Modifications
in the whole spectrum give us evidence of three structural phase transitions undergone by this amino
acid as well as two conformational change. The classification of the vibrational modes and the behavior
of their frequencies as a function of the pressure are presented.