AN INFRARED STUDY OF THE FORBIDDEN SYMMETRICAL STRETCHING MODE OF CARBON-DISULFIDE IN BINARY-MIXTURES WITH IODINE

A detailed study has been made of the 'excess' induced nu(1) band of C S2 in binary mixtures with iodine. A simple model based on the pair mo lecular interaction via an electrostatic quadrupole-dipole induction m echanism results in a very pleasing interpretation of the observed (ve ry weak) band profile. There is no need to invoke the involvement of d onor-acceptor interactions. The agreement between observed and calcula ted widths (using known correlation times and diffusion coefficients o f the individual components) is found to be extremely good. The main c onclusion is that both hindered rotational motion of the CS2 molecule and the relative two-body translational dynamics contribute to the obs erved bandwidth. This conclusion is in good agreement with that made f rom a far-infrared study of the nu(I-I) mode of the same system.