Relativistic Configuration Interaction Calculations for the J=3/2, 5/2 States of Mo VI

Relativistic configuration interaction calculations have been done for the 4p$^5$ 4d$^2$, $n$f ($n$=4-6) $J$=5/2 levels of Mo VI. The careful treatment of correlation is crucial to obtain accurate energy values. Besides, second-order effects and the magnetic Breit effects are also important, especially to the upper levels. There are only two measurements [1,2] for the 4p$^5$ 4d$^2$ levels to date. Our results are in good agreement with the most recent measurement [1] for the lower 9 levels of 4p$^5$ 4d$^2$. For the remaining 2 levels, the discrepancies are large ($>$ 3000 cm$^{-1}$). We have also calculated the oscillator strengths in both gauges for transitions $n$d $\rightarrow$ $n$f, 4p$^5$ 4d$^2$ $J$=5/2. The average gauge agreement of those big transitions ($f > 0.01$ ) is 6.6\% for $^2$D$_{3/2} \rightarrow J$=5/2, 5.0\% for $^2$D$_{5/2} \rightarrow J$=5/2. [1] A. Kancerevicius, A. Ramonas, A. Riabcevas and S. Ciurilovas {\em Lithuanian Journal of Physics} {\bf 31}, 251 (1991) [2] A. Tauheed, K. Rahimullah and M. S. Z. Chaghtai {\em Phys. Rev. A} {\bf 32}, 237 (1985)