With an improved method to eliminate the effects of chemical reactions with the target material, the wave-lengths of the sulphur Kα and β-lines were measured for the following substances: S, FeS, CoS, NiS, Cu₂S and ZnS. The superiority of the new technique over that usually employed is particularly evident in the spectrum of ZnS in which the Kβ-line is observed as a triplet instead of the single broad line heretofore observed. This result is independent of the target material. The Kβ-lines of CoS and NiS are observed for the first time. Two crystal modifications of ZnS, namely, zincblende and wurtzite, gave spectra which showed no appreciable differences.
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Joseph Valasek (1933) studied this question.