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Rate constants for the C(3P) + CH3OH reaction have been measured in acontinuous supersonic flow reactor over the range 50 K to 296 K. C(3P) wascreated by the in-situ pulsed laser photolysis of CBr4, a multiphoton processwhich also produced some C(1D), allowing us to investigate simultaneously thelow temperature kinetics of the C(1D) + CH3OH reaction. C(1D) atoms werefollowed by an indirect chemiluminescent tracer method in the presence ofexcess CH3OH. C(3P) atoms were detected by the same chemiluminescence techniqueand also by direct vacuum ultra-violet laser induced fluorescence (VUV LIF).Secondary measurements of product H(2S) atom formation have been undertakenallowing absolute H atom yields to be obtained by comparison with a suitablereference reaction. In parallel, statistical calculations have been performedbased on ab-initio calculations of the complexes, adducts and transition states(TSs) relevant to the title reaction. By comparison with the experimental Hatom yields, the preferred reaction pathways could be determined, placingimportant constraints on the statistical calculations. The experimental andtheoretical work are in excellent agreement, predicting a negative temperaturedependence of the rate constant increasing from 2.2 x 10-11 cm3 molecule-1 s-1at 296 K to 20.0 x 10-11 cm3 molecule-1 s-1 at 50 K. CH3 and HCO are found tobe the major products under our experimental conditions. As this reaction isnot considered in current astrochemical networks, its influence on interstellarmethanol abundances is tested using a model of dense interstellar clouds.

The fast C(3P) + CH3OH reaction as an efficient loss process for gas-phase interstellar methanol