Revised Analysis and Configuration Interaction in Mo~{\sc VI}

Mo {\sc vi}, with ground term 4p$^{6}$4d $^{2}$D, has a simple one-electron spectrum 4p$^{6}$\textit{nl-}4p$^{6}n^{\prime}l^{\prime}$ as well as a more complex spectrum arising from inner-shell excitations 4p$^{5}$4d$^{2 }$and$^{ }$4p$^{5}$4d5s. A few years ago we observed the spectrum of Mo~{\sc vi} from 200 to 5300 {\AA} with a sliding-spark and the 10.7-m normal- and grazing-incidence spectrographs at NIST. We revised a number of the known even levels of the one-electron spectrum [1] and confirmed the ionization limit [1],$^{ }$which was based largely on the Penning discharge observations of Romanov and Striganov [2]. A number of Romanov and Striganov's line identifications were also revised. Our results have not yet been published. More recently, we revisited the 4p$^{6}$(4d+5s)-4p$^{5}$(4d$^{2}$+4d5s) transitions and revised several of the core-excited levels [3]. Some levels of 4p$^{5}$4d$^{2}$ are highly mixed with one-electron levels, resulting in transitions at longer wavelengths between 4p$^{5}$4d$^{2}$ and one-electron levels. This provides accurate connections between the ground term and some highly-excited levels and thus highly accurate Ritz-type wavelength predictions for resonance transitions. Improved values have been obtained for all of the energy levels and a new least-squares fit for the odd configurations carried out. [1] B. Edl\'{e}n, et al., Phys. Scr. \textbf{32}, 215 (1985). [2] N. P. Romanov and A. R. Striganov, Opt. Spectrosc. (USSR) \textbf{27}, 8 (1969). [3] A. Kancerevicius et al., Lith. Phys. J. \textbf{31},143 (1991). Supported by Office of Fusion Energy Sciences of D.O.E.