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Topology of Potential Energy Surfaces near the X2A1/A2B2 Conical Intersections in NO2: Coupled Cluster Calculations
Huihui Deng1, Fubin Zhao1, Peizhen Li1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China.
Abstract:
The conical intersections (CoIns) between the ground state and the first excited state in NO2 are investigated using single-reference coupled-cluster (CC) theory. The topology of potential energy surfaces (PESs) near the X2A1/A2B2 CoIns is characterized. Several critical points, including the minima of both states, the two transition states on the ground state, and the minimum energy of CoIn (MECI), are identified. The topology of the CoIn seam and the potential energy curves along the two branching space vectors in the vicinity of MECI are analyzed. Furthermore, based on the topological features of the PESs, two possible adiabatic and nonadiabatic evolution mechanisms following photoexcitation of NO2 are discussed.
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