New pressure-induced phase transitions of l-threonine crystal: A Raman spectroscopic study

International audienceL-threonine crystal was studied by Raman spectroscopy under pressure in the spectral range from 50 to3300 cm1. The pressure range of a previous study has been extended from 4 to 27.0 GPa. Modificationsin the whole spectrum give us evidence of three structural phase transitions undergone by this aminoacid as well as two conformational change. The classification of the vibrational modes and the behaviorof their frequencies as a function of the pressure are presented