Rate coefficients for the depletion of ground-state oxygen atoms by CHF3 ha
ve been measured using a hie, temperature photochemistry (HTP) reactor. The
O atoms were generated by the vacuum ultraviolet (VUV) flash photolysis of
either SO2, O-2, Or CO2, and their relative concentrations were monitored
by resonance fluorescence. The data are best fitted by the expression k(630
-940 K) = 2.5 X 10(-11) exp(-7236 K/T) cm(3) molecule(-1) s(-1). The data a
re contiguous with those from an earlier laser-photolysis shock-tube study
for temperatures ranging from 960 to 1330 K. A fit to the combined data yie
lds the recommendation k(630-1330 K) = 5.1 X 10(-11) exp(-9536 K/T) cm(3) m
olecule(-1) s(-1), with 2 sigma precision levels varying from +/-8 and +/-
22% and corresponding suggested accuracy levels of +/- 22 to +/- 29%. Trans
ition-state theory predictions, made using input data from a literature ab
initio study, are in excellent agreement with this recommendation over the
entire temperature domain.