Electron impact single and double ionization of Niq+ ions (q=10, 11, 13 and 15)
(2004) 10th International Conference on the Physics of Highly Charged Ions (HCI 2000) — Location: CLARK KERR CAMPUS, BERKELEY (California) (30.July.2000)
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- Authors
Defrance, Pierre 
- Abstract
- Absolute cross sections for electron impact single and double ionization of Niq+ ions (q = 10, 11, 13 and 15) have been measured for energies from threshold to about 5 keV, Experimental results for Ni11+, Ni13+ and Ni15+ are in good agreement with the calculations of Pindzola et al, obtained in the average configuration distorted-wave approximation for the 3s(2)3p(n)(n = 5, 3 and 1) ground configurations, respectively. The Ni10+ results show a significant ionization signal below the ground state [Ne]3s(2)3p(6) threshold due to ions formed in the metastable configuration [Ne]3s(2)3p(5)3d in the parent ion beam. The theoretical calculations including direct ionization and excitation-autoionization from both the ground and the excited configurations underestimated the cross section. The difference is probably due solely to the 3s --> nl excitations. In this isonuclear sequence, the whole results shows that ions with an odd number of electrons behave differently from ions with an even number. Our measurements show clearly that double ionization is dominated by L-shell ionization followed by autoionization.
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Citations
Cherkani-Hassani, S., Khouilid, M., & Defrance, P. (2004). Electron impact single and double ionization of Niq+ ions (q=10, 11, 13 and 15). Physica Scripta : an international journal for experimental and theoretical physics, T92, 287-289. https://hdl.handle.net/2078.5/97784 (Original work published 2004)