Transformação de fase na L-alanina submetida a altas pressões

Abstract

Over the past decades, amino acids have gained increasing prominence in the field of physics, as they allow the study of chemical bonding under different thermodynamic conditions. This work aims to revisit studies on the vibrational properties of an L-alanine crystal subjected to extreme pressure conditions. The method employed was Raman spectroscopy, assisted by a diamond anvil cell, which enabled the material to be subjected to pressures up to 9.5GPa. The interpretation of the Raman spectra obtained allowed us to compare our results with investigations carried out by research groups in Brazil, Russia, and Scotland. It was observed, among others, that a band splitting occurs around 2GPa, confirming the results of the Brazilian group published in 2000, in which a phase transition was suggested at that pressure level.