Abstract
Highly resolved near infrared emission, excitation, and magneto-absorption spectra of ZnS polytypic crystals doped with Ni isotopes in low concentrations are presented. The detection of luminescence coinciding with the absorption allows to explain the entire structure in the high energy part of the spectrum as zero-phonon transitions within the Ni 2+ center in three differently symmetric environments. The correlation of the low energy part of the spectrum to a defect M-center has to be questioned. At least part of the transitions seem to be connected with Ni-centers, either by phonon coupling or by formation of complexes.
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