The spectrum of V v has been observed by using a vacuum sliding spark at 1000-A peak current. Fifty-nine lines in the region 480–8500 Å have been observed and interpreted as transitions among 29 levels, 19 of which are new. The ionization energy is determined as 526 524 ± 5 cm−1. An isoelectronic comparison confirms the inversion of the 3p64f2F5/2, 7/2∘ levels as being caused by their interaction with those of the 2F∘ term in the 3p53d2 configuration.
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