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The optical absorption and emission spectra of several ZnS: Mn crystals (0. 07 to 1. 0 mole%) were obtained at 4. 2 and 77^. Fine structure was observed in all bands. The predominant structure was identified in terms of phonon emission coupled to one electronic transition in each band. Zero-phonon lines were found at 17 891, 19 683, 21 237, 22 638, and 25 297 cm^-1. They should correspond to transitions between some levels of the cubic crystalline field---terms such as ^6A₁^4T₁, ^6A₁^4T₂, ^6A₁^4E, ^6A₁^4A₁, etc. Principal phonons participating are of energies of about 86, (183, 263), 298, and 340 cm^-1. Possible mode assignments are pointed out. In conclusion, we suggest that the usually observed widths and shape of manganese bands are due predominantly to phonon coupling.
Langer et al. (Mon,) studied this question.