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Title: Improved virtual orbital multireference Møller–Plesset study of the ground and excited electronic states of protonated acetylene, C2H
Authors: Chaudhuri, R. K
Feed, K. F
Keywords: Moller- Plesset;Virtual orbit;Acetylene
Issue Date: 7-Aug-2008
Publisher: American Institute of Physics
Citation: Journal of Chemical Physics, Vol. 129, No. 5, pp. 054308
Abstract: The ground state geometries and associated normal mode frequencies of the classical and nonclassical protonated acetylene ion, i.e., the vinyl cation C2H, are computed using the complete active space self-consistent field and improved virtual orbital (IVO) complete active space configuration interaction methods. In addition, the minimum-energy reaction path for the classical to nonclassical interconversion is determined (as are excitation energies) using the IVO modification of multireference Møller–Plesset (MRMP) perturbation theory. The IVO-MRMP treatment predicts the nonclassical structure to be 4.8 kcal/mol more stable than the classical one, which is consistent with other high level theoretical estimates. The proton affinity of acetylene from the IVO-MRMP treatment (154.8 kcal/mol) also agrees well with experiment (153.3 kcal/mol) and with earlier CASPT2 calculations (154.8 kcal/mol). We further report geometries and vibrational frequencies of low lying excited states of C2H, which have not been observed and/or studied before. Comparisons with previous highly correlated calculations further demonstrate the computational efficiency of the IVO-MRPT methods
ISSN: 0021-9606
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Appears in Collections:IIAP Publications

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