Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 139, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4811840
Keywords
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Funding
- National Natural Science Foundation of China (NNSFC) [21133006, 91221301, 91021010]
- Ministry of Science and Technology [2013CB834601]
- Department of Energy (DOE) [DE-FG02-05ER15694]
- U.S. Department of Energy (DOE) [DE-FG02-05ER15694] Funding Source: U.S. Department of Energy (DOE)
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Three-dimensional potential energy surfaces for the two lowest singlet ((A) over tilde B-1(1) and (B) over tilde (1)A(2)) and two lowest triplet ((a) over tilde (3)B1 and (b) over tilde (3)A(2)) states of SO2 have been determined at the Davidson corrected internally contracted multi-reference configuration interaction level with the augmented correlationconsistent polarized triple-zeta basis set (icMRCI+ Q/AVTZ). The non-adiabatically coupled singlet states, which are responsible for the complex Clements bands of the B band, are expressed in a 2 x 2 quasi-diabatic representation. The triplet state potential energy surfaces, which are responsible for the weak A band, were constructed in the adiabatic representation. The absorption spectrum spanning both the A and B bands, which is calculated with a three-state non-adiabatic coupled Hamiltonian, is in good agreement with experiment, thus validating the potential energy surfaces and their couplings. (C) 2013 AIP Publishing LLC.
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