Vi. Azarov et al., The sixth spectrum of iridium (Ir VI): Determination of the 5d(4), 5d(3)6sand 5d(3)6p configurations, PHYS SCR, 64(4), 2001, pp. 295-313
The spectrum of five times ionized iridium, Ir VI, was investigated in the
420-1520 Angstrom wavelength region. The analysis has led to the determinat
ion of the 5d(4), 5d(3)6s and 5d(3)6p configurations. Thirty of thirty four
theoretically possible 5d(4) levels, 27 of 38 possible 5d(3)6s levels and
96 of 110 possible 5d(3)6p levels have been established. The levels are bas
ed on 711 classified spectral lines. The level structure of the configurati
ons has been theoretically interpreted using the orthogonal operators techn
ique. The energy parameters have been determined by a least squares fit to
the observed levels. Calculated energy values and LS-compositions, obtained
from the fitted parameter values are given.