Positive Ion/Molecule Reactions in Tetrafluoroethylene

Abstract

Gas-phase ion/molecule reactions in tetrafluoroethylene (C2F4) were studied with a pulsed electron beam mass spectrometer. When a few Torr of major gas, N2, containing 1῎10 mTorr C2F4 was ionized by 2 keV electrons, CF3ῌ and C2F4 ῌ were formed as major ions. CF3 ῌ reacted with C2F4 rapidly to form C3F7 ῌ . The rate constant of reaction C2F4 ῌ ῌC2F4ΐC3F5 ῌ ῌCF3 was measured to be (1.5῍0.5)῎10῍11 cm 3 /moleculeῌs and found to be temperature-independent in the range of 180῎310 K.