Journal of Physical Chemistry p. 3298 - 3300 (1990)
Update date:2022-08-17
Topics:
Tsai, Cheng-ping
McFadden, David L.
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.
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