Theoretical Investigations of Rate Coefficients for H + O3 and HO2 + O Reactions on a Full-Dimensional Potential Energy Surface

The Journal of Physical Chemistry. a
Junxiang ZuoDaiqian Xie

Abstract

In this work, a machine learning method is used to construct a high-fidelity multichannel global reactive potential energy surface (PES) for the HO3 system from 21452 high-level ab initio calculations at the explicitly correlated multireference configuration interaction (MRCI-F12) level of theory. The permutation invariance of the PES with respect to the three identical oxygen atoms is enforced using permutation invariant polynomials (PIPs) in the input layer of a neural network (NN). This PIP-NN representation is highly faithful to the ab initio points, with a root-mean-square error of 0.20 kcal/mol. Using this PES, the kinetics of H + O3 → OH + O2 (R1) and HO2 + O → OH + O2 (R2) reactions were investigated using a quasi-classical trajectory method over a wide temperature range (200-2000 K). It was found that the calculated thermal rate coefficients of R1 and R2, exhibiting positive and negative temperature dependences, respectively, are in reasonably good agreement with most experimental measured values. These temperature dependences can be attributed to the presence and absence of an entrance channel potential barrier.

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Citations

Feb 13, 2021·The Journal of Physical Chemistry Letters·Qixin ChenDaiqian Xie
Apr 30, 2021·The Journal of Physical Chemistry. a·Toshiyuki Takayanagi
Nov 6, 2020·The Journal of Physical Chemistry. a·Andrew L FergusonJim Pfaendtner
Oct 7, 2020·Chemical Reviews·Sergei Manzhos, Tucker Carrington
Nov 6, 2020·The Journal of Physical Chemistry. B·Andrew L FergusonJim Pfaendtner
Sep 25, 2020·The Journal of Physical Chemistry Letters·Jun LiHua Guo
Sep 24, 2021·The Journal of Physical Chemistry. a·Robin LawlerSeung Soon Jang

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