Rate constants for the reactions ofCH

The rate constants for the reactions of CH3O radicals with 3 reactants have been measured by two different techniques: laser photolysis (LP) and fast flow reactor (FF), both coupled with a detection of CH3O radicals by laser induced fluorescence. The reaction with formaldehyde CH2O has been measured in the temperature range 295 - 450 K. Both sets of results (LP and FF) are in excellent agreement and lead to a pressure independent rate constant of k1=(1.1±0.3)×10-12exp (9.6±1.0 kJ mol-1/RT) cm3 s-1. The reaction with acetaldehyde CH3CHO has been measured between 286 and 493 K. Both sets of experiments are again in excellent agreement and lead to a pressure independent rate constant of k2=(5.7±1.3)×10-13exp (-5.2±0.7 kJ mol-1/RT) cm3 s-1. No reaction could be detected with isobutane i-C4H10 at temperature up to 356 K, leading to an upper limit for k3≤2.5×10-15 cm3 s-1