Quantum dynamics of the O + OH -> H + O2 reaction at low temperatures

Details Quantum dynamics of the O + OH -> H + O2 reaction at low temperatures Quantum dynamics of the O + OH -> H + O2 reaction at low temperatures

Publishing date

2008-10-16

URL

arxiv.org/abs/0810.2832v1

Journals

J. Chem. Phys. 129, 224309 (2008)

Science

Physics

Field

Atomic Physics

Additional info

8 pages, 10 figures

Type

Scientific paper

Digital Object Identifier

10.1063/1.3035904

Abstract

We report quantum dynamics calculations of the O + OH -> H + O2 reaction on two different representations of the electronic ground state potential energy surface (PES) using a time-independent quantum formalism based on hyperspherical coordinates. Calculations show that several excited vibrational levels of the product O2 molecule are populated in the reaction. Rate coefficients evaluated using both PESs were found to be very sensitive to the energy resolution of the reaction probability, especially at temperatures lower than 100 K. It is found that the rate coefficient remains largely constant in the temperature range 10-39 K, in agreement with the conclusions of a recent experimental study [Carty et al., J. Phys. Chem. A 110, 3101 (2006)]. This is in contrast with the time-independent quantum calculations of Xu et al. [J. Chem. Phys. 127, 024304 (2007)] which, using the same PES, predicted two orders of magnitude drop in the rate coefficient value from 39 K to 10 K. Implications of our findings to oxygen chemistry in the interstellar medium are discussed.

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