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A theoretical investigation of the excited states of OCLO radical, cation, and anion using the CASSCF/CASPT2 method
Author(s) -
Wei ZiZhang,
Li BuTong,
Zhang HongXing,
Sun ChiaChung,
Han KeLi
Publication year - 2006
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.20538
Subject(s) - complete active space , rydberg formula , basis set , chemistry , ion , ionization energy , atomic physics , excited state , perturbation theory (quantum mechanics) , adiabatic process , ionization , computational chemistry , physics , density functional theory , quantum mechanics , organic chemistry
Using the complete active space self‐consistent field method with a large atomic natural orbital basis set, 10, 13, and 9 electronic states of the OClO radical, OClO + cation, and OClO − anion were calculated, respectively. Taking the further correlation effects into account, the second‐order perturbation (CASPT2) calculations were carried out for the energetic calibration. The photoelectron spectroscopy of the OClO radical and OClO − anion were extensively studied in the both case of the adiabatic and vertical ionization energies. The calculated results presented the relatively complete assignment of the photoelectron bands of the experiments for OClO and its anion. Furthermore, the Rydberg states of the OClO radical were investigated by using multiconfigurational CASPT2 (MS‐CASPT2) theory under the basis set of large atomic natural orbital functions augmented with an adapted 1s1p1d Rydberg functions that have specially been built for this study. Sixteen Rydberg states were obtained and the results were consistent with the experimental results. © 2006 Wiley Periodicals, Inc. J Comput Chem 28: 467–477, 2007