ABSOLUTE RATE CONSTANTS AND REACTIVE CROSS-SECTIONS FOR THE REACTIONS OF O((1)D) WITH MOLECULAR-HYDROGEN AND DEUTERIUM Academic Article uri icon

abstract

  • Abstract The dynamics of the reaction of O (1 D) with molecular hydrogen and deuterium has been investigated using “superthermal” O (1 D) atoms generated by laser photolysis of N 2 O 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 σ R have been determined: k=(2.7±0.6)× 10− 10 cm 3 s− 1 molecule− 1 and σ R (0.12 eV)= 7.6±1.5 Å 2 for the reaction O (1 D)+ H 2→ OH+ H, and k=(2.3±0.5)× 10− 10 cm 3 s− 1 molecule− 1 and σ R (0.18 eV)= 7.0±1.4 Å 2 for the reaction O (1 D)+ D 2→ OD+ D.

publication date

  • January 1, 1993