Reaction of formaldehyde cation with methane: Effects of collision energy and H_2CO~+ and methane vibrations

摘要

The effects on the title reaction of collision energy (E_(col)), five H_2CO~+ vibrational modes, and deformation vibrations of methane have been studied, including the measurement of product integral and differential cross sections over a center-of-mass E_(col) range from 0.09-3.3 eV. Electronic structure and RRKM calculations are reported, providing an additional mechanistic insight. The total reaction efficiency is well below unity, despite there being two exoergic reaction pathways with no activation barriers. The energetically more favorable channel corresponds to H elimination (HE) from an intermediate complex, however, this channel accounts for only approx 15% of the total reaction cross section at low E_(col) and is negligible at high energies. The dominant channel, hydrogen abstraction (HA) by H_2CO~+ from methane, is dominated by a complex-mediated mechanism at low E_(col), switching over to a direct hydrogen-stripping mechanism at high E_(col). Both HA and HE are inhibited in a strongly mode-specific fashion by H_2CO~+ vibrational excitations, and greatly enhanced by excitation of methane deformation vibrations. The strong mode specificity indicates that the reaction-limiting step occurs early in the collisions.