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dc.contributor.authorGhosh, A-
dc.contributor.authorChaudhuri, R. K-
dc.contributor.authorChattopadhyay, S-
dc.contributor.authorMahapatra, U. S-
dc.identifier.citationJournal of Computational Chemistry, Vol. 36, No. 26, pp. 1954-1972en_US
dc.descriptionRestricted Accessen_US
dc.description.abstractUsing four-component (4c) relativistic spinors, we present a computationally economical relativistic ab initio method for molecular systems employing our recently proposed second-order state-specific multireference perturbation theory (SSMRPT) incorporating the improved virtual orbital-complete active space configuration interaction (IVO-CASCI) reference wavefunction. The resulting method, 4c-IVO-SSMRPT [calculate one state at a time] is tested in pilot calculations on the homonuclear dimers including Li2, Na2, K2, Rb2, F2, Cl2, and Br2 through the computations of the ground state potential energy curves (PECs). As SSMRPT curbs intruder effects, 4c-IVO-SSMRPT is numerically stable. To our knowledge, the SSMRPT in the 4c relativistic framework has not been explored in the past. Selective spectroscopic constants that are closely related to the correct shape and accuracy of the energy surfaces have been extracted from the computed PECs. For the halogen molecules, a relativistic destabilization of the bond has been found. Relativistic and electron correlation effects need to be incorporated to get reliable estimates. Our results are in good accordance with reference theoretical and experimental data which manifests the computational accuracy and efficiency of the new 4c-IVO-SSMRPT method. The method opens for an improved description of MR systems containing heavy elements. The inexpensiveness of IVO-CASCI makes 4c-IVO-SSMRPT method promising for studies on large systems of heavy elements.en_US
dc.publisherJohn Wiley & Sonsen_US
dc.rights© John Wiley & Sons-
dc.subjectFour-component relativistic spinorsen_US
dc.subjectDiatomic halogensen_US
dc.subjectAlkali dimersen_US
dc.subjectFull dissociation energy curvesen_US
dc.subjectSpectroscopic constantsen_US
dc.titleRelativistic state-specific multireference perturbation theory incorporating improved virtual orbitals: application to the ground state single-bond dissociationen_US
Appears in Collections:IIAP Publications

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