Interpretation of the odd parity energy levels in the spectrum of neutral tungsten

Abstract

The lowest odd parity levels of neutral tungsten belong to the configurations 5d46s6p, 5d36s26p and 5d56p with important effects of LS coupling breakdown and configuration interaction that prevented so far attributions to multiplets simply from measured intensities and Landé factors. The parametric (Racah–Slater) method, supported by ab initio evaluations of radial parameters (HFR method of Cowan), leads to the description of 215 energy levels with a mean error of 131 cm−1. Only two levels were missing below 43 000 cm−1 and they have been located at 29 823.09 cm−1 (J = 0) and 37 451.33 cm−1 (J = 6).