Abstract
The density of states is calculated for a random distribution of donor-pairs of hydrogenlike impurities in three- and two-dimensional systems. Recent investigations of the hydrogen molecule in the alternant–molecular–orbital approximation are here extended. We found that the lowest excited state 1Σu (i.e., H+H−), which is optically connected to the ground state, plays a relevant role in the absorption spectra of semiconductor systems.
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