Isotopic selectivity in infrared multiphoton dissociation of CF3CH(D)BrCl

Abstract

The infrared multiphoton dissociation of CF₃CDBrCl in the presence of equimolar CF₃CHBrCl was investigated with attention to the isotopic selectivity of the reaction. Large selectivity was found at pressures lower than 3 Torr [1 Torr =(101 325/760) Pa]. Several products were obtained, and the molar fraction of deuterium-containing species (deuterium fraction) of each product was measured. The products were classified into two groups with respect to the pressure and fluence dependences of the deuterium fraction. A reaction scheme, consistent with the experimental results, is proposed.