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Five substitutional donors have been observed in ZnSe: Al, Ga, In, Cl, and F. By measuring the I₂ lines and the two-electron transitions associated with each, the donor binding energies have been determined. These are found to be close to the effective-mass value and vary from 26. 3 meV for Al to 29. 3 meV for F. Excited states of the complex formed by the exciton bound to the neutral donor were observed both in the region above the I₂ lines and in the two-electron transitions. The electron effective mass was measured from the Zeeman splitting of the 2p states of the donors to be m= (0. 160. 01) m₄. For each donor, a doublet was also observed at lower energy than the I₂ lines; these doublets are believed to be the corresponding I₃ lines. The binding energies of excitons both to the ionized and the neutral donors were found to vary linearly with the donor central-cell correction. Most of these results are closely analogous to the properties of CdS and CdSe.
Merz et al. (Sat,) studied this question.