Potential energy surfaces for O + O2 collisions

Z. Varga, Yuliya Paukku, Donald G. Truhlar

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We present global potential energy surfaces for nine adiabatic electronic states of O3, namely, 1 1A′, 2 1A′, 1 1A″, 1 3A′, 2 3A′, 1 3A″, 1 5A′, 2 5A′, and 1 5A″. These are the states of O3 that are accessed in electronically adiabatic collisions of a ground-state triplet O2 molecule with a ground-state triplet O atom. The surfaces are based on XMS-CASPT2 electronic structure calculations with dynamically scaled external correlation. The active space has 12 active electrons distributed in the nine 2p orbitals. The adiabatic surfaces are fitted to analytic functions using a many-body expansion where the pairwise additive term is fitted to an accurate diatomic potential including a damped dispersion term, and the many-body part, without disconnected terms, is fitted with permutationally invariant polynomials in mixed exponential-Gaussians to the electronic structure data points. The selection and weighting of points for the fits are designed to produce surfaces suitable for describing energy transfer and dissociation in high-energy collisions.

Original languageEnglish
Article number154312
JournalJournal of Chemical Physics
Volume147
Issue number15
DOIs
Publication statusPublished - Oct 21 2017

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Potential energy surfaces
potential energy
Ground state
Electronic structure
collisions
Electronic states
electronic structure
Energy transfer
analytic functions
ground state
Polynomials
Atoms
polynomials
Molecules
Electrons
energy transfer
dissociation
orbitals
expansion
electronics

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Potential energy surfaces for O + O2 collisions. / Varga, Z.; Paukku, Yuliya; Truhlar, Donald G.

In: Journal of Chemical Physics, Vol. 147, No. 15, 154312, 21.10.2017.

Research output: Contribution to journalArticle

Varga, Z. ; Paukku, Yuliya ; Truhlar, Donald G. / Potential energy surfaces for O + O2 collisions. In: Journal of Chemical Physics. 2017 ; Vol. 147, No. 15.
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