Excitation of positive ions by low-energy electrons - Relevance to the Io Torus

Details Excitation of positive ions by low-energy electrons - Relevance to the Io Torus Excitation of positive ions by low-energy electrons - Relevance to the Io Torus

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5499s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E3, p. 5499-5504.

Physics

3

Atomic Excitations, Io, Positive Ions, Space Plasmas, Toruses, Electron Transitions, Forbidden Transitions, Particle Collisions, Jupiter, Satellites, Io, Ions, Electrons, Torus, Excitation, Energy, Charged Particles, Laboratory Studies, Collisions, Strength, Resonance, Polarization, Parameters, Spectra, Procedure, Techniques, Magnesium, Oxygen, Calculations, Theoretical Studies, Scattering

Scientific paper

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.

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