Theoretical rate of dissociative recombination of HCO+ and DCO+ ions
Abstract
The article presents an improved theoretical description of dissociative recombination of HCO+ and DCO+ ions with a low energy electron. In the previous theoretical study (Phys. Rev. A 74, 032707) on HCO+, the vibrational motion along the CO coordinate was neglected. Here, all vibrational degrees of freedom, including the CO stretch coordinate, are taken into account. The theoretical dissociative recombination cross-section obtained is similar to the previous theoretical result at low collision energies (<0.1 eV) but somewhat larger at higher (>0.1 eV) energies. Therefore, the present study suggests that motion along the CO coordinate does not play a significant role in the process at low collision energies. The theoretical cross-section is still approximately 2-3 times lower than the data from a recent merged-beam experiment.