Abstract
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. 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 cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} are (4.9 {plus minus} 0.9) {times} 10{sup {minus}10} for CHF + H, (2.4 {plus minus} 0.4) {plus minus} {times} 10{sup {minus}11} for CHF + N, and (1.4 {plus minus} 0.2) {times} 10{sup {minus}10} for CHF + O. These reactions appear to proceed by an association-elimination mechanism.
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