A crossed-beam study of the reaction O(1D)+D2: Collisional energy dependence of differential cross-section

Abstract

The dynamics of the title reaction were investigated in a crossed-beam investigation at four different collision energies, ranging from 1.79 to 4.87 kcal mol⁻¹. At the level of detail of the doubly differential cross section (in angle and speed), a dramatic and systematic variation with the increase in collision energy was noted. We ascribed the variation to the contribution from an additional abstraction pathway to the reaction. Comparing the results at higher collision energies with that at 1.79 kcal mol⁻¹, which was assumed to be insertion only, the extent of abstraction contribution to total reactivity was deduced and its dominant dynamical features revealed. The former was found to be in reasonable agreement with our previous estimate based on the excitation function data. Major aspects of the latter were found in corroboration of those reported recently for the analogous O(¹D)+HD reaction.