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CASPT2 study on low‐lying states of HBN and HNB radicals
Author(s) -
Li WenZuo,
Cheng JianBo,
Li QingZhong,
Gong BaoAn,
Sun JiaZhong
Publication year - 2011
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.22410
Subject(s) - isomerization , chemistry , potential energy , excited state , ground state , radical , perturbation theory (quantum mechanics) , transition state , atomic physics , physics , quantum mechanics , biochemistry , organic chemistry , catalysis
Abstract In this study, some low‐lying states of the HBN and HNB radicals have been studied using multiconfiguration second‐order perturbation theory. The geometries of all stationary points along the potential energy surfaces (PESs) were optimized at the CASPT2/cc‐pVQZ level. The ground and the first excited states of HBN were predicted to be X 2 Π and A 2 Σ + states, respectively. It was predicted that the ground state of HNB is X 2 Σ + state. The A 2 Π state of HNB has unique imaginary frequency, which was different from the previously published results. A bending local minimum M1 was found for the first time along the 1 2 A ″ PES, and the A 2 Π state of HNB should be the transition state of the isomerization reactions for M1 ↔ M1. The CASPT2/ANO potential energy curves (PECs) of isomerization reactions for HBN ↔ HNB were calculated as a function of HBN bond angle. By comparing the CASPT2 and CASSCF calculated results, we concluded that the influence of the dynamic electron correlation on HBN ↔ HNB system is not large. © 2009 Wiley Periodicals, Inc. Int J Quantum Chem, 2011