Kinetics of the reaction of the CH2Cl radical with oxygen atoms

The kinetics of the reaction of CH2Cl with O(3P) has been investigated in a heatable tubular reactor coupled to a photoionization mass spectrometer. The decay of CH2Cl was monitored as a function of O atom concentration ([O]0/[CH2Cl]0 > 30) to determine the rate constant of the reaction as a function of temperature and pressure. The rate constant measured is independent of density and was fitted to an Arrhenius expression: k = (1.49 ± 0.35) × 10−10exp[(1.46 ± 0.38) kJ mol−1/RT] cm3 molecule−1 s−1 over the temperature range 297–823 K. Both CHClO and CH2O were detected as products of the CH2Cl + O(3P) reaction. The production of CHClO is the major reaction channel.