Determination of the pressure-dependent rate constant CFO+O-2 in a F/F-2/CHFO/O-2 gas mixture at 298 K

Homogeneous gas phase reactions in F/F-2/CHFO mixtures with helium as a bath gas were studied pure and with addition of oxygen at ambient temperature. A computer-controlled discharge flow system with mass spectrometric detection was used. The accessible pressure range was 1.6-3.5 mbar. A more precise value for the reaction CFO+CFO-->CF2O+CO was determined: k((2a)) = (1.7(-0.3)(+0.4)). 10(-12) cm(3) molecules(-1)s(-1). No discernible pressure dependence was found for CFO+F-->CF2O: k((3a)) = (5.0(-1.4)(+3.3)). 10(-12) cm(3) molecules(-1)s(-1). Fluoroformyl peroxy radicals were formed by CFO+O-2+M-->CF(O)O-2+M. The pressure dependence of this reaction could be described by k(O(4)) = (4.5(-1.1)(+2.2)). 10(-31) cm(-6) molecules(-2)s(-1) and K-infinity(4) = (1.7+/-0.3). 10(-12) cm(3) molecules(-1)s(-1). A small bath gas dependence of k((4)) was noted.