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IMPORTANCE OF RELATIVISTIC CORRECTIONS TO THE SPECTRUM OF WATER AND HYDROGEN SULPHIDE

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/20490

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Title: IMPORTANCE OF RELATIVISTIC CORRECTIONS TO THE SPECTRUM OF WATER AND HYDROGEN SULPHIDE
Creators: Barletta, P.; Tennyson, Jonathan; Polyansky, Oleg L.; Császár, A. G.
Issue Date: 2002
Abstract: The importance of effects as small as minor relativistic corrections in theoretical predictions of energy levels can be as high as few wavenumbers [1]. Two-electron relativistic corrections to the ground-state electronic energy of water and hydrogen sulphide are determined at over 300 (250) geometries. The corrections include the two-electron Darwin term of the Coulomb-Pauli Hamiltonian, and the Gaunt and Breit corrections, calculated perturbationally using four-component variational Dirac-Hartree-Fock wavefunctions. Fitted relativistic correction surfaces are constructed and used with an accurate ab initio nonrelativistic Born-Oppenheimer potential to calculate vibrational and rotational levels. The calculations suggest that these two-electron relativistic corrections, which have so far been neglected in rovibrational calculations on light molecules, have a substantial influence on the ro-vibrational levels [2]. The effects considered have markedly different characteristics for the stretching and bending levels.
URI: http://hdl.handle.net/1811/20490
Other Identifiers: 2002-RF-05
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