Author/Authors :
Brownsword، نويسنده , , R.A. and Hillenkamp، نويسنده , , M. and Schmiechen، نويسنده , , P. and Volpp، نويسنده , , H.-R. and Wolfrum، نويسنده , , J.، نويسنده ,
Abstract :
The dynamics of the OH + HD reaction were studied in the gas-phase using the laser photolysis/vacuum-UV laser-induced fluorescence “pump-and-probe” technique. Translationally energetic OH(2Π) radicals with an average reagent translational energy of Ec.m. = 0.24 eV in the (OH-HD)-center-of-mass system were generated by the laser photolysis of H2O2 at 248 nm. Doppler profiles of nascent D and H atoms produced in reactive collisions of OH with room-temperature HD molecules were detected under single-collision conditions by VUV-LIF at the Lyman-α transition. For the OH + HD reaction an absolute reaction cross section of σR(0.24 eV) = (0.14 ± 0.05) Å2 was determined by means of a calibration method using OH +D 2 as a reference reaction. The branching ratio for the OH + HD → H + HOD (D + H2O) product channels was measured to be ΓH/D = (1.2 ± 0.2).
