Chemical Reactions of H and D Atoms with NO₂ and CINO, a Crossed Molecular Beam Study

Abstract

Abstract The chemical reactions of H and D atoms with NO 2 and CINO have been studied at a collision energy Ē = 0.44 eV (42 kJ/mol) in a crossed molecular beam experiment. Velocity and angular distributions were measured and are used to construct the center of mass (CM) distributions. The earlier reported isotope effect of the angular distributions for H, D + NO 2 is shown to be due to the different CM to LAB conversions. The CM angular distribution is nearly isotropic for H + NO 2 , but shows strong backward peaking for H + CINO. The measured translational energy spectra are in agreement with recent fluorescence and chemiluminescence results. The reaction H + NO 2 proceeds via a long lived intermediate complex, while H + CINO is a direct reaction.