The spectrum of five times ionized titanium, Ti VI

The spectrum of five times ionized titanium emitted from a sliding spark and a vacuum spark discharge has been observed using a 5-m grazing incidence spectrograph and a 3-m normal incidence spectrograph. About 450 lines in the region 125 Å to 2315 Å have been identified as combinations between 64 odd levels belonging to the 3 s 2 3 p 5 , 3 s 3 p 5 3 d , 3 s 2 3 p 3 3 d 2 and 3 s 2 3 p 4 4 p and 4 f configurations and 72 even levels of the 3 s 3 p 6 , 3 s 2 3 p 4 3 d , 4 d , 5 d , 4 s and 5 s configurations. The level structure of the observed configurations has been theoretically interpreted by means of calculations including configuration interactions. The energy parameters determined from least-squares fits to the observed levels are compared with theoretical values obtained from the Cowan computer code.