Pourestarabadi S, Dehestani M. Non-adiabatic coupling in the potential energy surfaces of SO
2 molecule.
Phys Chem Chem Phys 2023;
25:24526-24538. [PMID:
37661660 DOI:
10.1039/d3cp02127k]
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Abstract
To investigate the potential energy surfaces and the coupling between the adiabatic states of SO2 molecules, it is necessary to consider the non-adiabatic coupling terms (NACTs), where the Born-Oppenheimer approximation breaks down. In this work, we analyze the conical intersections between 1 1A1 and 1 1B2 states (the A' states in Cs symmetry) and 1 1A2 and 1 1B1 states (the A'' states in Cs symmetry) using NACTs and adiabatic-to-diabatic transformation (ADT) angles. Our results confirm reasonable interaction between 1 1A1 and 1 1B2 states and strong interaction between 1 1A2 and 1 1B1 states.
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