Absolute cross sections for electron impact excitation out of the metastable levels of Ar
- Univ. of Wisconsin, Madison, WI (United States)
Electron excitation out of the Ar metastable levels into levels of the 3p{sup 5}4p configuration has been studied by measuring the intensities of several lines of the 3p{sup 5}4p to 3p{sup 5}4s transition. The authors use two metastable atom sources. A hollow cathode discharge produces a relatively dense metastable target with, however, an extremely large ground state Ar concentration. The second experiment uses charge exchange of Ar{sup +} with cesium to produce a primarily Ar beam with a relatively low metastable density of 10{sup 6} atoms/cm{sup 3}. The absolute calibration is performed with the charge exchange source. In general, the excitation process is characterized by extremely large cross sections (e.g. much larger than or comparable to cross sections for excitation from the 2{sup 3}S level of He into the 3{sup 3}L levels of He) having broad shapes as a function of electron energy. Exceptions to this behavior are the cross sections for excitation into the 2p{sub 1} and 2p{sub 5} levels (Paschen`s notation).
- OSTI ID:
- 394330
- Report Number(s):
- CONF-9605105--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 41; ISSN 0003-0503; ISSN BAPSA6
- Country of Publication:
- United States
- Language:
- English
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