On the spectrum of ionised tin (Sn III)

To help in the detection of series in In II attempts have been made to find regularities in Sn III. Visual observations under varying conditions of excitation revealed a strong triplet in the region λ5100. The detection of two more triplets, particularly a diffuse multiplet, confirmed the above identification. A member of the first fundamental series has also been found with the aid of the corresponding members in In II and Ga II. A possible triplet of the first sharp series is suggested, and evidence of its correctness is sought by correlating it with corresponding members of related spectra.