The dynamics of the reaction of O(1D) with molecular hydrogen and deuterium has been investigated using "superthermal" O(1D) atoms generated by laser photolysis of N2O at 193 nm. H/D atom products have been detected under single-collision conditions by vacuum ultraviolet laser-induced fluorescence at the Lyman-α transition. With a calibration method using HCl photolysis as a source of well-defined H atom concentrations, the following absolute rate constants k and absolute reactive cross sections σR have been determined: k= (2.7±0.6) × 10-10 cm3 s-1 molecule-1 and σR(0.12 eV) =7.6±1.5 Å2 for the reaction O(1D)+H2→OH+H, and k=(2.3±0.5)×10-10 cm3 s-1 molecule-1 and σR(0.18 eV)=7.0±1.4 Å2 for the reaction O(1D)+D2→OD+D.
ASJC Scopus subject areas
- Physics and Astronomy (all)
- Physical and Theoretical Chemistry