Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/5394
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dc.contributor.authorNayak, M. K-
dc.contributor.authorChaudhuri, R. K-
dc.date.accessioned2011-03-01T10:12:43Z-
dc.date.available2011-03-01T10:12:43Z-
dc.date.issued2011-02-
dc.identifier.citationPhysical Review A, vol. 83, No. 2, 022504en
dc.identifier.urihttp://hdl.handle.net/2248/5394-
dc.descriptionOpen Access-
dc.description.abstractThe spin-rotational Hamiltonian parameters A∥ and A⊥ for the BaF molecule are calculated using four-component relativistic spinors at the second-order many-body perturbation theory (MBPT) level via the Z-vector technique. The second-order MBPT is applied to assess the accuracy of the computed hyperfine-structure constants before studying the problem with the state-of-the-artcoupled cluster with single and double excitations (CCSD) method which is highly accurate but computationally more expensive than MBPT. The hyperfine-structure constants A and Ad resulted from these calculations agree favorably well with experimental findings and with other correlated calculations. The convergence behavior of A and Ad with respect to the number of active orbitals used in the perturbative calculations suggests that our estimated A and Ad values should be accurate.en
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.urihttp://link.aps.org/doi/10.1103/PhysRevA.83.022504en
dc.rights© American Physical Societyen
dc.subjectRelativistic corrections-
dc.subjectHyperfine structure-
dc.subjectRelativistic configuration interaction and many-body perturbation calculations-
dc.titleDetermination of molecular hyperfine-structure constant using the second-order relativistic many-body perturbation theoryen
dc.typeArticleen
Appears in Collections:IIAP Publications

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