STUDIES OF MOLECULAR MOTIONS AND VIBRATIONAL-RELAXATION IN ACETONITRILE .2. INFRARED INTENSITIES OF UPSILON-1,2-UPSILON-1,UPSILON-3 AND 2-UPSILON-3 BANDS AND ESTIMATION OF BROADENING CONTRIBUTIONS DUE TO DIPOLE AND TRANSITION DIPOLE INTERACTIONS

We have used infrared intensity measurements (including overtone data) to estimate the contribution of transition dipole-transition dipole and dipole-dipole interactions to the broadening of the isotropic Raman band profiles of ν1 and ν3 of acetonitrile. The quality of agreement between observed and calculated second moments has enabled us to draw useful conclusions about the relative contributions to band broadening from these and other, shorter range, potentials. In particular, it seems likely that dispersive forces may play a significant role both in the liquid phase and on dilution in carbon tetrachloride. © 1979.