VIBRATIONAL PREDISSOCIATION IN ACETYLENE AND HYDROGEN CYANIDE - HYDORGEN HALIDE COMPLEXES

Abstract

The opto-thermal detection technique has been used to obtain high resolution infrared spectra of a series of acetylene and hydrogen cyanide - hydrogen halide (HCl, DCl, HBr, and HI) binary complexes. Despite the fact that the acetylenic stretch in the acetylene - HX complexes is remote from the hydrogen bond, the homogeneous linewidths are observed to be large. Of particular interest are the results obtained for acetylene - HCl and DCl, which suggest that a near resonant V - V channel is present in the former, but not in the latter, and is responsible for the short lifetimes. In the hydrogen cyanide - HX complexes, the C-H stretch is again remote from the hydrogen bond; however, the transitions associated with the C-H stretch for the HCN complexes are narrow