Dissociative photoionization of CH₂Cl₂ and enthalpy of formation of CHCl⁺: Experiments and calculations

Dissociative photoionization of CH₂Cl₂ to form fragment ions CH₂Cl⁺, CHCl⁺, and CCl⁺ was studied with a photoionization mass spectrometer using synchrotron radiation as an ionization source. IE of CH₂Cl₂, AE of the three fragment ions, and relative branching ratios were derived from their photoionization efficiency curves. Dissociative photoionization channels for production of CH₂Cl⁺, CHCl⁺, and CCl⁺ were identified based on comparison of the experimental and calculated dissociation energies.