Nascent kinetic energy distributions of the ions produced by electron-impact on the CH3F molecule

The nascent translational energy distributions of ions produced by electron-impact on CH3F, prepared in a skimmed supersonic expansion, have been investigated by their correlation with the time-of-flight mass-spectrometry band profiles. The electron energies used in the collisions range from the ionisation threshold to 100 eV. CH3F+ and other ion fragments close in mass are characterized by low average kinetic energies. Medium-sized mass ion fragments, have kinetic energy distributions with average values of ca. 1 eV, whilst atomic ions have the highest average energies. The set of ion nascent energy distributions produced by electron-impact on CH3F, at several electron energies, are reported.