Vibrational Levels And Resonances On A New Potential Energy Surface For The Ground Electronic State Of Ozone

Ndengue, Steve Alexandre

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https://hdl.handle.net/2142/50867 Copy

Description

Title

Vibrational Levels And Resonances On A New Potential Energy Surface For The Ground Electronic State Of Ozone

Author(s)

Ndengue, Steve Alexandre

Contributor(s)

• Carrington, Tucker
• Wang, Xiao-Gang
• Dawes, Richard

Issue Date

2014-06-16

Keyword(s)

Mini-symposium: Spectroscopy in Kinetics and Dynamics

Abstract

The isotopic ratios for ozone observed in laboratory and atmospheric measurements, known as the ozone isotopic anomaly,[1,2] have been an open question in physical and atmospheric chemistry for the past 30 years. The biggest limitation in achieving agreement between theory and experiment has been the availability of a satisfactory[3-5] ground state potential energy surface (PES). The presence of a spurious reef feature in the asymptotic region of most PESs has been associated with large discrepancies between calculated and observed rates of formation especially at low temperature. We recently proposed a new global potential energy surface for ozone[6,7] possessing 4 features that make it suitable for kinetics and dynamics studies: excellent equilibrium parameters, good agreement with experimental vibrational levels, accurate dissociation energy and a transition region with accurate topography (without the reef artifact). This PES has been used recently to simulate the temperature dependent exchange reaction (16O+16O2) with a quantum statistical model[6,7], and, for the first time, a negative temperature dependence which agrees with experiments was obtained, indicating the good quality of this global surface. A quantum description of the ozone exchange and recombination reaction requires knowledge of the resonances but also the rovibrational levels just below the dissociation. We present results of global 3-well vibrational-state calculations up to the dissociation threshold and (J = 0) resonances up to 1000 \wn beyond. The calculations were done using a large DVR basis (~24 million functions) with a symmetry-adapted Lanczos algorithm as well as MCTDH. Results indicate the presence of localized bound states at energies close to the dissociation threshold beyond which some long-lived resonances follow, contrasted with a few delocalized bound states with density at large values of the stretching coordinates. References: 1- K. Mauersberger et al., Adv. At. Mol. Opt. Phys. 50, 1 (2005) 2- R. Schinke et al., Ann. Rev. Phys. Chem. 57, 625 (2006) 3- R. Siebert et al., J. Chem. Phys. 116, 9749 (2002) 4- M. Ayouz and D. Babikov, J. Chem. Phys. 138, 164311 (2013) 5- V.G. Tyuterev et al., J. Chem. Phys. 139, 134307 (2013) 6- R. Dawes et al., J. Chem. Phys. 135, 081102 (2011) 7- R. Dawes et al., J. Chem. Phys. 139, 201103 (2013)

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/50867

DOI

https://doi.org/10.15278/isms.2014.MH12

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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