Gas-Phase Atom-Radical Kinetics of Atomic Hydrogen, Nitrogen, and Oxygen Reactions with CHF Radicals.

Article abstract of DOI:10.1021/j100371a017

The absolute rate constants for the reactions of atomic hydrogen, nitrogen and oxygen with CHF radicals have been measured in a gas-flow system with photoionization mass spectrometry detection.CHF(<*>¹A') radicals were produced by dissociation of CH2F2, CH2FCl, or CHFBr2 in a radiofrequency discharge.CHFBr2 proved unsatisfactory as a precursor for CHF in kinetics studies.Atomic reactants were produced by dissociation of the corresponding elemental gas in a microwave discharge.The pressure was 1.7 Torr.The rate constants for CHF decay under pseudo-first-order conditions at 293 K in units of cm³ molecule^-1 s^-1 are (4.9 +/- 0.9) * 10^-10 for CHF + H, (2.4 +/- 0.4) * 10^-11 for CHF + N, and (1.4 +/- 0.2) * 10^-10 for CHF + O.These reactions appear to proceed by an association-elimination mechanism.