Issue 19, 2016

Influence of vibration in the reactive scattering of D + MuH: the effect of dynamical bonding

Abstract

The dynamics of the D + MuH(v = 1) reaction has been investigated using time-independent quantum mechanical calculations. The total reaction cross sections and rate coefficients have been calculated for the two exit channels of the reaction leading, respectively, to DMu + H and DH + Mu. Over the 100–1000 K temperature range investigated the rate coefficients for the DMu + H channel are of the order of 10−10 cm3 s−1 and those for the DH + Mu channel vary between 1 × 10−12 and 8 × 10−11 cm3 s−1. These results point to a virtually barrierless reaction for the DMu + H channel and to the presence of a comparatively small barrier for the DH + Mu channel and are consistent with the profiles of their respective collinear vibrationally adiabatic potentials (VAPs). The effective barrier in the VAP of the DH + Mu channel is located in the reactant valley and, consequently, translation is found to be more efficient than vibration for the promotion of the reaction over a large energy interval in the post threshold region. Below this barrier, the DH + Mu channel can be accessible through an indirect mechanism implying crossing from the DMu + H pathway. The most salient feature found in the present study is revealed in the total reaction cross section for the DMu + H channel, which shows a sharp resonance caused by the presence of a deep well in the vibrationally adiabatic potential. This well has a dynamical origin, reminiscent of that found recently in the vibrationally bonded BrMuBr complex [Fleming, et al., Angew. Chem., Int. Ed., 2014, 53, 1], and is due to the stabilizing effect of the light Mu atom oscillating between the heavier H and D isotopes and to the bond softening associated with vibrational excitation of MuH.

Graphical abstract: Influence of vibration in the reactive scattering of D + MuH: the effect of dynamical bonding

Article information

Article type
Paper
Submitted
25 Feb 2016
Accepted
12 Apr 2016
First published
15 Apr 2016

Phys. Chem. Chem. Phys., 2016,18, 13530-13537

Author version available

Influence of vibration in the reactive scattering of D + MuH: the effect of dynamical bonding

V. Sáez-Rábanos, J. E. Verdasco, F. J. Aoiz and V. J. Herrero, Phys. Chem. Chem. Phys., 2016, 18, 13530 DOI: 10.1039/C6CP01305H

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