The correlation between the phase transitions and vibrational properties by Raman spectroscopy:: liquid-solid β and solid β-solid α acetonitrile transitions

Raman spectra of the internal vibrational modes: v(5)(E), v(1)(A(1)), v(2)(A(1)), v(6)(E), v(3)(A(1)), v(4)(A(1)), v(8)(E) and the external modes in the region of 15-200 cm(-1) of acetonitrile have been recorded in the 77-293 K range at the atmospheric pressure. One of the goals of the paper is to develop a correlation between the liquid-solid beta and solid beta -solid alpha transitions of acetonitrile on the one hand and the vibrational properties of the internal and external lattice modes on the other. The Raman spectra of acetonitrile in the region of the phase transitions have been recorded for the first time. (C) 2001 Published by Elsevier Science B.V.