Bulg. J. Phys. vol.44 no.1 (2017), pp. 076-083

"Forbidden" Electric Dipole Transitions in the Hydrogen Molecular Ion – First Estimates

P. Danev
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia 1784, Bulgaria
Abstract. The H2+ molecular ion is a simple three body homonuclear system. It has zero electrical dipole momentum and small spectral lines natural width, features making H2+ a suitable candidate for a high precision time standard. In order to select the optimal transition lines for such purposes, a complete understanding of the structure and the characteristics of all lines of interest is needed. In the present work we have contributed to solving this problem by extending the class of possible candidates with a detailed study of the so-called ``forbidden'' electric dipole transitions, i.e. transitions that are forbidden by selection rules in the non-relativistic limit. By adding spin interactions, due to mixing of states with opposite parity under nucleus exchange, these transitions receive a small, but different from zero intensity.

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