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Gas-phase ion chemistries in perfluoromethylcyclohexane

Electron impact ionization and ion–molecule reactions of perfluoromethylcyclohexane (C7F14) using Fourier-transfer mass spectrometry are reported. The electron impact ionization produces dominant ions and throughout most of the energy range of 10–200 eV, with the total ionization cross section peaking at ∼100 eV with a value of 1.8 × 10−15 cm2. Numerous ions are observed at energies within a few electron volts of the lowest ionization threshold: , , , , , and . The lighter ions CF+, and are found to react with C7F14 forming and other product ions that we believe to result from further fragmentation of the intermediate ion . The charge transfer reaction between Ar+ and C4F14 yields similar product ions.