Citation: XIE An-dong, SHI De-heng, ZHU Zun-lue, ZHU Zheng-he. Analytical Potential Energy Functions for the Electronic States X 1Σ+, A 1Π and B 1Σ+ of BH Molecule[J]. Acta Physico-Chimica Sinica, ;2005, 21(06): 658-662. doi: 10.3866/PKU.WHXB20050616
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The energies, equilibrium geometries and harmonic frequencies of three electronic states (the ground state X 1Σ+, the first degenerate state A 1Π and the second state B 1Σ+)of BH molecule have been calculated using the GSUM (group sum of operators) method of SAC/ SAC-CI with the basis sets D95++, 6-311++g and cc-PVTZ. Comparing among the above mentioned three basis sets, the conclusion is gained that the basis set cc-PVTZ is the most suitable for the energy calculation of BH molecule. The whole potential curves for these three electronic states are further scanned using SAC/cc-PVTZ method for the ground state and SAC-CI/cc-PVTZ methods for the excited states, then having a least square fitting to Murrell-Sorbie function, and last the spectroscopy constants (Be, αe, ωe, andωeχe) are calculated, which are in better agreement with the experimental data. It is believed that Murrell-Sorbie function form and SAC/ SAC-CI method are suitable not only for the ground state, but for the low-lying excited states as well.
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