Abstract
Absorption spectra of dilute Ni2+ centers in melts of CsCl, RbCl, KCl, NaCl, LiCl, MgCl2, CsBr, KBr, and LiBr were measured in the near-infrared, visible, and, in a few instances, ultraviolet regions. Substantial differences were found in these spectra which correlated with the size of the cations in the solvent salts. The coordination geometry of halides about nickel in CsCl, CsBr, RbCl, KCl, and KBr melts was identified from the spectra as distorted tetrahedral. Coordination geometry in the remaining melts was uncertain. The spectrum for MgCl2 as solvent was very similar to that for LiCl as solvent.
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