Electron ionization and gas-phase ion molecule reactions of methylcyclohexane

摘要

Absolute cross sections for electron ionization of methylcyclohexane (MCH, C_7H_(14)) are measured as a function of the electron energy in a range of 10-200 eV. The electron ionization of MCH produces the parent ion C_7H_(14)~+ and fragment ions C_6H _(11)~+ and C_4H_7~+ as the predominant product ions at most of the electron energies studied. Reactions between selected hydrocarbon ions with the neutral MCH molecule, mainly via hydride transfer, charge transfer and H_2~- transfer mechanisms, are studied. Absolute rate constants are reported, and the correlations between the reactivities and the thermochemical data of the reactions are discussed. The Binary-Encounter-Bethe method is applied to MCH to provide a theoretical comparison to the sum of the measured ionization cross sections.