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 E c.m. = 0.24 eV in the (OH-HD)-center-of-mass system were generated by the laser photolysis of H 2O 2 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 σ R (0.24 eV) = (0.14 ± 0.05) A ̊ 2 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 + H 2O) product channels was measured to be Γ H/D = (1.2 ± 0.2).
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