Since the discovery of ozone depletion, the doublet electronic states of the ozone radical cation have received much attention in experimental and theoretical investigations, while the low-lying quartet states have not. In the present research, viable pathways to the quartet states from the lowest three triplet states of ozone, , , and , and excitations from the and states of the ozone radical cation have been studied in detail. The potential energy surfaces, structural optimizations, and vibrational frequencies for several states of ozone and its radical cation have been thoroughly investigated using the complete active space self-consistent field, unrestricted coupled cluster theory from a restricted open-shell Hartree-Fock reference including all single and double excitations (UCCSD), UCCSD method with the effects of connected triple excitations included perturbatively, and unrestricted coupled cluster including all single, double, and triple excitations with the effects of connected quadruple excitations included perturbatively. These methods used Dunning’s correlation-consistent polarized core-valence basis sets, (, T, Q, and 5). The most feasible pathways (symmetry and spin allowed transitions) to the quartet states are , , , , , , , and with vertical ionization potentials of 12.46, 12.85, 12.82, 12.46, 12.65, 13.43, 13.93, and , respectively.
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7 June 2008
Research Article|
June 03 2008
Toward the observation of quartet states of the ozone radical cation: Insights from coupled cluster theory
Lucas D. Speakman;
Lucas D. Speakman
Center for Computational Chemistry,
The University of Georgia
, 1004 Cedar Street, Athens, Georgia 30602, USA
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Justin M. Turney;
Justin M. Turney
Center for Computational Chemistry,
The University of Georgia
, 1004 Cedar Street, Athens, Georgia 30602, USA
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Henry F. Schaefer, III
Henry F. Schaefer, III
a)
Center for Computational Chemistry,
The University of Georgia
, 1004 Cedar Street, Athens, Georgia 30602, USA
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a)
Electronic mail: sch@uga.edu.
J. Chem. Phys. 128, 214302 (2008)
Article history
Received:
February 08 2008
Accepted:
April 17 2008
Citation
Lucas D. Speakman, Justin M. Turney, Henry F. Schaefer; Toward the observation of quartet states of the ozone radical cation: Insights from coupled cluster theory. J. Chem. Phys. 7 June 2008; 128 (21): 214302. https://doi.org/10.1063/1.2924128
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