The absolute rate constants for the reactions of atomic hydrogen with CF3, CF2, and CF radicals have been measured in a gas flow system with photoionization mass spectrometry detection. CF3, CF2, and CF were produced by dissociation of CF3Br, CF2HC1, and CH2FC1, respectively, in a radio frequency discharge. H atoms were produced by dissociation of the elemental gas in a microwave discharge. The pressure was 1.7 Torr. The rate constants at 293 K in units of cm3 molecule"1 s"1 are (9.1 ± 1.5) X 10"11 for CF3 + H, (3.9 ± 0.7) X 10"11 for CF2 + H, and (1.9 ± 0.3) X 10"11 for CF + H. Hydrogen fluoride was detected as the principal stable product in all three reactions. The mechanism of fluorine atom abstraction is discussed.

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ChemInform Abstract (study by means of photoionization mass spectrometry).