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Issue 15, 2017
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A global coupled cluster potential energy surface for HCl + OH ↔ Cl + H2O

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Abstract

A new and more accurate full-dimensional global potential energy surface (PES) for the ground electronic state of the ClH2O system is developed by fitting 15 777 points obtained using an explicitly correlated unrestricted coupled-cluster method with single, double, and perturbative triple excitations (UCCSD(T)-F12b). The fitting is carried out using the permutation invariant polynomial-neural network (PIP-NN) method and has an error of 6.9 meV. The new PES has a slightly lower barrier for the atmospherically important HCl + OH → Cl + H2O reaction than the previous PES based on multi-reference configuration interaction (MRCI) calculations. As a result, it should provide a better characterization of the kinetics. Quantum dynamical calculations of reaction probabilities for both the forward and reverse reactions are performed on this new PES and compared with those on the MRCI PES. They reveal notable differences, resulting apparently from subtle differences in the PESs.

Graphical abstract: A global coupled cluster potential energy surface for HCl + OH ↔ Cl + H2O

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Publication details

The article was received on 11 Feb 2017, accepted on 10 Mar 2017 and first published on 13 Mar 2017


Article type: Paper
DOI: 10.1039/C7CP00920H
Citation: Phys. Chem. Chem. Phys., 2017,19, 9770-9777
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    A global coupled cluster potential energy surface for HCl + OH ↔ Cl + H2O

    J. Zuo, B. Zhao, H. Guo and D. Xie, Phys. Chem. Chem. Phys., 2017, 19, 9770
    DOI: 10.1039/C7CP00920H

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