✍ Scribed by A. Jacobs; H.R. Volpp; J. Wolfrum
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Using translationally hot H atoms generated via the photolysis of HBr at 193 nm, we have investigated the dynamics of the reaction H + D20--,OD + H D at a center-of-mass energy of Ec.m. = 2.53 eV. The nascent OD (v= 0) rotational distribution was probed by laser-induced fluorescence. We found that only a small fraction (2.3%) of the total available energy appears as rotational energy of the OD product molecule and within our detection limit no OD (v= 1 ) could be found. The absolute reactive cross section aR=0.11 +0.02 A 2 at Ec.m.=2.53 eV was determined by means of a calibration method and was found to be 2.4 times smaller than the reactive cross section of the reaction H + H20--,OH + H2 at a comparable center of mass energy of Ec.m. = 2.52 eV.
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