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Electron excitation cross sections for the 2s(2)2p(3)4S(O) -- 2s(2)2p(3)2D(O) (forbidden) and 4S(O) -- 2s2p(4) 4P (resonance) transitions in O IIExperimental and theoretical excitation cross sections are reported for the first forbidden transition 4S(O) -- 2S(2)2p(3) 2D(O) (lambda-lambda 3726, 3729) and the first allowed (resonance) transition 4S(O) -- 2s2p(4) 4P(lambda-833) in O II. Use is made of electron energy loss and merged-beams methods. The electron energy range covered is 3.33 (threshold) to 15 eV for the S -- D transition, and 14.9 (threshold) to 40 eV for the S -- P transition. Care was taken to assess and minimize the metastable fraction of the O II beam. An electron mirror was designed and tested to reflect inelastically backscattered electrons into the forward direction to account for the full range of polar scattering angles. Comparisons are made between present experiments and 11-state R-matrix calculations. Calculations are also presented for the 4S(O) -- 2s(2)2p(3)2P(O) (lambda-2470) transition.
Document ID
19950041436
Document Type
Reprint (Version printed in journal)
Authors
Zuo, M. (Jet Propulsion Lab. Cal. Inst. of Tech., Pasadena, CA, United States)
Smith, Steven J. (Jet Propulsion Lab. Cal. Inst. of Tech., Pasadena, CA, United States)
Chutjian, A. (Jet Propulsion Lab. Cal. Inst. of Tech., Pasadena, CA, United States)
Williams, I. D. (Jet Propulsion Lab. Cal. Inst. of Tech., Pasadena, CA, United States)
Tayal, S. S. (Clark Atlanta Univ. Atlanta, GA, United States)
Mclaughlin, Brendan M. (Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Date Acquired
August 16, 2013
Publication Date
February 10, 1995
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 440
Issue: 1
ISSN: 0004-637X
Subject Category
ATOMIC AND MOLECULAR PHYSICS
Distribution Limits
Public
Copyright
Other