Abstract
The spectrum of doubly ionized tungsten (W III) was produced in a sliding-spark discharge and recorded photographically on the NIST 10.7-m normal-incidence vacuum spectrograph in the 600-2680 Å spectral region. The analysis has led to the establishment of 71 levels of the interacting 5d(4), 5d(3) 6s and 5d(2) 6s(2) even configurations and 164 levels of the interacting 5d(3) 6p and 5d(2) 6s 6p odd ones. A total of 2636 lines have been classified as transitions between the 235 experimentally determined levels. Comparison between the observed levels and those calculated from matrix diagonalizations with least-squares fitted parameters shows an rms deviation of ±87 cm(-1) for the even configurations and ±450 cm(-1) for the odd ones.