Multiphoton ionization of vinylchloride, trifluoroethylene, and benzene at 193 nm

The multiphoton ionization–fragmentation pattern of vinylchloride, trifluoroethylene and benzene has been measured at 193 nm using time-of-flight mass spectrometry and gas chromatographic analysis. Relative cross sections for multiphoton ionization and the laser power dependence have been determined for the three species at 193 nm at low laser fluence (<10 mJ/cm2) and relative cross sections for multiphoton ionization of benzene have been obtained at 193 and 248 nm. The dominant fragmentation and ionization channels in the two substituted ethylenes are discussed.