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Excitation of positive ions by low-energy electrons - Relevance to the Io TorusThe 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.
Document ID
19930049237
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Smith, Steven J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Chutjian, A.
(JPL Pasadena, CA, United States)
Mawhorter, R. J.
(Pomona College Claremont, CA, United States)
Williams, I. D.
(Belfast, Queen's Univ. United Kingdom)
Shemansky, D. E.
(Southern California Univ. Los Angeles, CA, United States)
Date Acquired
August 16, 2013
Publication Date
March 25, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: E3
ISSN: 0148-0227
Subject Category
Astrophysics
Accession Number
93A33234
Distribution Limits
Public
Copyright
Other

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