Time-dependent quantum wave packet studies of the F+HCL and F+DCI reactions

摘要

Full three-dimensional time-dependent quantum wave-pack calculations have been carried out for the F+HCl and F+DCl reactions on a maDy-body expansion of the ground 2A'HClF potential energy surface. The calculated energy-dependence of reaction probability exhibits oscillating structure in the F + HCl reaction but not in the F + DCI system. The effects of initial state excitation on the total reaction probabilities as a function of collision energy are investigated for reactions from " various initial vibrational and rotational states of HCl and DCI. Our results show that reagent i vibrational and/or rotational excitation can generally lead to an increase in reaction probability at t low collision energy and a slight decrease at relatively high collision energy. Therirtal rate constants ; for the title reactions are calculated and they are in generally good agreement with experimental Imeasurement. Investigation of steric effects for the reactions indicates that the H (or D) side of HCl (or DCl) molecule is only slightly favored for reactive attack and reaction proceeds from almost all attack angles. The present results iridicate that the HID kinetic isotope effect should not be totally neglected.