dc.creator Balasubramanian, T. K. en_US dc.creator Bellary, V. P. en_US dc.date.accessioned 2006-06-15T18:08:46Z dc.date.available 2006-06-15T18:08:46Z dc.date.issued 1988 en_US dc.identifier 1988-MF-6 en_US dc.identifier.uri http://hdl.handle.net/1811/17498 dc.description $^{1}$ E. Wigner and E.E. Witmer, Z. Physik 51, 859 (1928). $^{2}$ G. Herzberg, Molecular Spectra and Molecular Structure Vol.1 (Spectra of Diatomic Molecules) Van Nostrand, New York (1950). $^{3}$ L.D. Landau and E.M. Lifshitz, Quantum Mechanics, Pergamon Press, London (1965). en_US dc.description Author Institution: Spectroscopy Division, Bhabha Atomic Research Centre Modular Laboratories en_US dc.description.abstract The rules for building the manifold of electronic states of a diatomic molecule from those of the separated atoms were originally given by Wigner and $Witmer^{1}$. Most of these $rules^{2}$ seem intuitively plausible and their validity is readily $demonstrated^{3}$. An exception is the derivation of the terms for a homonuclear diatomic molecule from the separated atoms in identical atomic states. Here the answer to the important question of the u or g character of the resulting molecular state is not so obvious. In the original $paper^{1}$ this point has been settled by resorting to group theoretical arguments. We have been able to show that the same results could be obtained by invoking a simple model which reduces the problem to one akin to the Heitler-London treatment of the $H_{2} molecule^{2}$. In the limit of strong spin-orbit coupling in the atoms, the model can be extended readily to derive Hund's case (c) molecular states. en_US dc.format.extent 162853 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title ON THE WIGNER - WITMER CORRELATION RULES IN DIATOMIC MOLECULES en_US dc.type article en_US
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