The CH2Cl + CH3 (1) and CHCl2 + CH3 (2) cross-radical reactions were studied by laser photolysis/ photoionization mass spectroscopy. Overall rate constants were obtained in direct real-time experiments in the temperature region 301-800 K and bath gas (helium) density (6-12) x 10(16) atom cm(-3). The observed rate constant of reaction I can be represented by an Arrhenius expression k(1) = 3.93 x 10(-11) exp(91 K/T) cm(3) molecule(-1) s(-1) (+/- 25%) or as an average temperature-independent value of k(1) = (4.8 +/- 0.7) x 10(-11) cm(3) molecule(-1) s(-1). The rate constant of reaction 2 can be expressed as k(2) = 1.66 x 10(-11) exp(359 K/T) cm(3) molecule(-1) s(-1) ( 25%). C2H4 and C2H3Cl were detected as the primary products of reactions I and 2, respectively. The experimental values of the rate constant are in reasonable agreement with the prediction based on the "geometric mean rule." A separate experimental attempt to determine the rate constants of the high-temperature CH2Cl + O-2 (10) and CHCl2 + O-2 (11) reaction resulted in an upper limit of 1.2 x 10(-16) cm(3) molecule(-1) s(-1) for k(10) and k(11) at 800 K.