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Excitation of positive ions by low-energy electrons: Relevance to the Io torus
- Source :
- Journal of Geophysical Research: Planets. 98:5499-5504
- Publication Year :
- 1993
- Publisher :
- American Geophysical Union (AGU), 1993.
-
Abstract
- The importance of measuring electron-ion excitation cross sections in singly and multiply charged positive ions is outlined, and recent results for Mg II and O II ions are given using the JPL's electron energy-loss merged-beams apparatus. Theoretical comparisons are given with two five-state close-coupling calculations. The energy variation of the collision strength is fitted with a semiempirical analytic function which includes approximations to polarization, resonance, and exchange contributions. In O II, first spectra anywhere of electron excitation of the optically allowed transitions are presented. In addition, excitations of two low lying, optically forbidden transitions are detected for the first time.
- Subjects :
- Physics
Atmospheric Science
Ecology
Paleontology
Soil Science
Forestry
Electron
Aquatic Science
Oceanography
Resonance (particle physics)
Spectral line
Charged particle
Ion
Geophysics
Space and Planetary Science
Geochemistry and Petrology
Atomic electron transition
Electron excitation
Earth and Planetary Sciences (miscellaneous)
Atomic physics
Excitation
Earth-Surface Processes
Water Science and Technology
Subjects
Details
- ISSN :
- 01480227
- Volume :
- 98
- Database :
- OpenAIRE
- Journal :
- Journal of Geophysical Research: Planets
- Accession number :
- edsair.doi...........ae5af111e8e48a033c9b8d95f9f4d0b4