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Hyperfine energy levels of alkali-metal dimers : ground-state homonuclear molecules in magnetic fields.

Aldegunde, J. and Hutson, Jeremy M. (2009) 'Hyperfine energy levels of alkali-metal dimers : ground-state homonuclear molecules in magnetic fields.', Physical review A., 79 (1). 013401.


We investigate the hyperfine energy levels and Zeeman splittings for homonuclear alkali-metal dimers in low-lying rotational and vibrational states, which are important for experiments designed to produce quantum gases of deeply bound molecules. We carry out density-functional theory calculations of the nuclear hyperfine coupling constants. For nonrotating states, the zero-field splittings are determined almost entirely by the scalar nuclear spin-spin coupling constant. By contrast with the heteronuclear case, the total nuclear spin remains a good quantum number in a magnetic field. We also investigate levels with rotational quantum number N=1, which have long-range anisotropic quadrupole-quadrupole interactions and may be collisionally stable. For these states the splitting is dominated by nuclear quadrupole coupling for most of the alkali-metal dimers and the Zeeman splittings are considerably more complicated.

Item Type:Article
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Publisher statement:© 2009 The American Physical Society
Date accepted:No date available
Date deposited:12 July 2013
Date of first online publication:January 2009
Date first made open access:No date available

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