Newly Identified Lines in the NE i Isoelectronic Sequences

Using a graxing-incidence spectrometer and a low inductance, 14- F, 12-17 kV spark source, the authors have observed spectra of Sc xu, Ti xiii, and V xiv. The lines have been identified as arising from transitions between the ground level 2s2 2p6 iS0 and the following electronic configurations: 2s 2p6 3p, and 2s2 2p5 4s, 4d, 5d. The transitions of the type 2s2 2p8-2s2 2p5 4d have been observed also in Co xviii, Ni xix, and Cu xx.