On series in the spark spectra of germanium

Abstract

Of the spectra of the elements of Group IV of the Periodic Table, that of germanium has been the subject of only a few investigations, probably due to the minute quantities in which the metal is available. Among the earliest measurements of the spectrum were those made by Rowland and Tatnall, Kobb, Exner and Haschek and Eder and Valenta, which were collected by Kayser.* For many years our knowledge of the structure of the spectrum was limited practically to the few constant frequency interval groups pointed out by Paulson among the arc lines. McLennan and McLay identified, with the aid of these groups, a few of the important combination multiplets involving the chief characteristic terms 3 - P 012 1 D 2 1 S 0 and 3 P 1 P of the neutral atom.