Absolute reactive cross sections for the reaction H+O 2→OH+O

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Using translationally excited H atoms generated by 193 nm photolysis of HCl and HBr, we have investigated the reaction H+O 2 at center-of-mass collision energies of E 1=1.86±0.26 eV, E 2=2.14±0.18 eV and E 3=2.57±0.19 eV. The nascent OH vibrational and rotational distributions were probed by laser-induced fluorescence. With a calibration method using H 2O 2 photolysis as a well-defined source of OH radicals, absolute reactive cross sections at single-collision energies could be determined: σ R(1.86 eV) =0.37±0.20 Å 2, σ R(2.14 eV)=0.25±0.14Å 2 and σ R(2.57 eV)=0.10±0.05 Å 2.