VUV dissociative photoionization of CHF2Cl

VUV dissociative photoionization of CHF2Cl in an energy region ∼12–22 eV was investigated with photoionization mass spectroscopy (PIMS) using synchrotron radiation (SR). The ionization energy of CHF2Cl and appearance energies for its fragment ions, CHF2+, CF+, CHF+, CHFCl+, CF2+, Cl+, CFCl+, CCl+, HCl+, CF2Cl+, H+ and CHCl+, were determined with photoionization efficiency spectroscopy (PIES). The dissociation energies of some possible dissociation channels to produce those fragment ions were also determined experimentally. The total energies of CHF2Cl and its main photofragments were calculated using Gaussian 98 program and Gaussian – 2 calculations. And then, the ionization energy of CHF2Cl, appearance potentials for its fragment ions, and the dissociation energies to produce them were predicted using high accuracy energy model. The mechanism of photoionization and photodissociation of CHF2Cl was discussed deeply based on comparison of our experimental results with those predicted theoretically. According to our research results, the experimental dissociation energies were in reasonable agreement with either the calculated dissociation energies (Ed) or the reaction barriers V (G2) of possible photodissociation channels of CHF2Cl.