The spark spectra of tellurium— Te IV and Te VI

Of the spectra of the elements of the sixth group of the Periodic Table, our knowledge of the series regularities in the spectra of tellurium appears to be the most meagre. McLennan, McLay and McLeod* have suggested, in part tentatively, a few of the deepest combinations of the arc spectrum, and Gibbs and Vieweg have discovered the triplets and a few of the singlets of the spectrum of quadruply-ionised tellurium. Besides these, so far as the author is aware, there are no published records of the analysis of the various spectra of this element. In a former communication!, the doublet system characteristic of selenium IV has been described. Following this work it was considered that the doublet system of the corresponding spectrum of tellurium of the same chemical group could be easily identified. The present paper gives an analysis, as so far obtained, of the third and fifth spectra of the element.