RATE CONSTANTS FOR REMOVAL OF CH(D) (V=0 AND 1) BY COLLISIONS WITH N-2, CO, O-2, NO AND NO2 AT 298K AND WITH CO2 AT 296-LESS-THAN-OR-EQUAL-TO-T K-LESS-THAN-OR-EQUAL-TO-873/

A combination of laser photolysis and laser-induced fluorescence has b een used to study removal rate constants of CH(upsilon = 0 and 1) radi cals in collisions with N-2, CO, O-2, NO and NO2 at room temperature a nd with CO2 in the temperature range 296-873 K. The removal rate const ants of CD(upsilon = 0 and 1) in collisions with O-2, NO, NO2 and CO2 are also measured at room temperature. Removal rate constants for CH(u psilon = 0) with N-2 and CO are found to be pressure dependent, wherea s those for CH(upsilon = 1) are found to be pressure independent and s ignificantly faster than those measured for the unexcited radicals. Re moval rate constants for all CH radical species in collisions with O-2 NO and NO2 are found to be very similar. In the case of NO and NO2, t he corresponding rate constants are close to the hard-sphere collision al rate constant, indicating that these reactions proceed on attractiv e potential energy surfaces with little or no barrier to reaction. Rem oval rate constants for CH(upsilon = 0) with CO2 are found to be press ure independent at room temperature and to have a complex temperature dependence.