Structure and zeeman-effect in the spectrum of the tantalum atom Ta I

Abstract

The analysis of existing wavelength data of the Ta I spectrum results in the detection of 6 ground levels and numerous higher terms, in addition to those reported by previous investigators. The total number of classified lines is now 687. They correspond to combinations between 19 even ground levels and 98 odd high levels. The Z e e m a n-effect is investigated in the region 2500–8500 Å and of practically all levels the g-values can be determined. The low terms belong to the configurations 5 d 36 s 2 and 5 d 46 s; no levels of 5 d 5 could be detected. The odd levels originate in the configurations 5 d 26 s 26 p, 5 d 36 s6 p and 5 d 46 p, the most important multiplets of which can be identified.