Abstract

Dehydrohalogenation of vinyl chloride, to form acetylene and HCL, is produced by irradiation with infrared laser pulses in the 9–11 μm region. The acetylene itself is broken down to yield diacetylene and elemental carbon and hydrogen when irradiated by focussed laser pulses. Initial excitation into vibrational modes of different symmetry appears to be about equally effective in converting absorbed energy to chemical reaction. The results are analyzed in terms of several models for multiple infrared photon dissociation; threshold energies of 20· 50 J/cm 2 are deduced.

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