Infrared emission spectroscopy of the products of UV-dissociated chloroethylenes

Abstract

The chloroethylenes are known to undergo dissociation under ultraviolet light to form chloroacetylenes. We report here the infrared emission spectra of the products of 193 nm dissociation of vinyl chloride, trans- and cis-dichloroethylene, vinylidene chloride, and trichlorothylene. The spectra reported here represent molecules that have undergone from four to 40 collisions. The most prominent features of these spectra are that the products are very highly vibrationally excited. The energy partitioning possibilities that are consistent with these results are discussed.