On the level system of Bi II

The spectrum of Bi II was remeasured in the wavelength range 620?74?nm, using different hollow cathode light sources, resulting in 91 new classified lines. We found two even and eight odd new levels. Fine and hyperfine structure analysis has been performed with a many configurations approach. We determined for all levels the Land? gJ-factors and the hfs A-constants, using the wavefunctions calculated. For the first time, radial hyperfine structure parameters were determined for the excited configurations 6s26pnl (l = s, p, d, f, g). We will also discuss the important role of configuration interaction effects on fine and hyperfine structures.