Ms. Pindzola et Dc. Griffin, ELECTRON-IMPACT IONIZATION OF TUNGSTEN IONS IN THE CONFIGURATION-AVERAGE DISTORTED-WAVE APPROXIMATION, Physical review. A, 56(2), 1997, pp. 1654-1657
Single-ionization cross sections for W4+, W5+, and W6+ are calculated
in the configuration-average distorted-wave approximation. Contributio
ns from excitation autoionization are found to be strong for each ion.
When comparing theory with the recent crossed-beams measurements of S
tenke et al. [J. Phys. B 28, 2711 (1995)], ionization from the ground
configuration dominates for W4+ and W5+, while ionization from metasta
bles of excited configurations dominates for W6+.