Ionization of positive argon ions by electron impact
The ''Krion'' electron-beam source has been used to determine the ionization cross sections of argon ions between Ar/sup +4/ and Ar/sup +12/ at incident-electron energies approx.2.5 +- 0.15 keV. The cross sections were obtained by comparing theoretical calculations with the spectrum of charge states of the ions as functions of the time of interaction with the electron beam. To achieve satisfactory agreement between the calculated and measured results, the theoretical model of ionization must include both single-electron and two-electron ionization in a single collision for the ions Ar/sup +5/ and Ar/sup +6/. This procedure was used to obtain the following total and partial ionization cross sections (in units of 10/sup -18/ cm/sup 2/): sigma/sub 4/=4.6; sigma/sub 5/=3.5 (sigma/sub 5//sub arrow-right//sub 6/=2.05; sigma/sub 5//sub arrow-right//sub 7/=1.45); sigma/sub 6/=2.3 (sigma/sub 6//sub arrow-right//sub 7/ =0.92; sigma/sub 6//sub arrow-right//sub 8/=1.38); sigma/sub 7/=1.4; sigma/sub 8/=0.88; sigma/sub 9/=0.65; sigma/sub 10/=0.45; sigma/sub 11/approx.0.30; sigma/sub 12/approx.0.20. The uncertainties in these values amount to +- 15%. The experimental ionization cross sections are compared with calculated values.
- Research Organization:
- Joint Institute for Nuclear Research
- OSTI ID:
- 7322583
- Journal Information:
- Sov. Phys. - JETP (Engl. Transl.); (United States), Vol. 43:6
- Country of Publication:
- United States
- Language:
- English
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