Abstract
A method for calculating the low-lying states of a color center having two trapped electrons is developed by using the basic idea of the polaron model of an electron-excess color center proposed in a recent paper. An application of this method to the interstitial ${\mathrm{H}}^{\ensuremath{-}}$ ion in KCl is given. It turns out that the ${U}_{1}$ absorption band may be due to the optical transition from the ground state of an ${\mathrm{H}}^{\ensuremath{-}}$, which is located at an interstitial site tetrahedrally surrounded by four alkali ions as well as by four halide ions in the crystal, to its $1s2p$-like singlet excited state modified by the crystal field.
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