On the Significance of the Contribution of Multiple-Electron Capture Processes to Cometary X-Ray Emission

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We report laboratory studies of the role played by multiple-electron capture (MEC) in solar wind induced cometary X-ray emission. Collisions of Ne{sup 10+} with He, Ne, Ar, CO, and CO{sub 2} have been investigated by means of the traditional singles X-ray spectroscopy in addition to the triple-coincidence measurements of X-rays, scattered projectile, and target recoil ions for the atomic targets. The coincidence measurements enable the reduction of the singles X-ray spectra into partial spectra originating in single-electron capture (SEC) and MEC collisions. The measurements provide unequivocal evidence for a significant role played by MEC, and strongly suggest that models based ... continued below

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PDF-file: 17 pages; size: 0.2 Mbytes

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Ali, R; Neill, P A; Beiersdorfer, P; Harris, C L; Rakovi?, M J; Wang, J G et al. May 12, 2005.

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We report laboratory studies of the role played by multiple-electron capture (MEC) in solar wind induced cometary X-ray emission. Collisions of Ne{sup 10+} with He, Ne, Ar, CO, and CO{sub 2} have been investigated by means of the traditional singles X-ray spectroscopy in addition to the triple-coincidence measurements of X-rays, scattered projectile, and target recoil ions for the atomic targets. The coincidence measurements enable the reduction of the singles X-ray spectra into partial spectra originating in single-electron capture (SEC) and MEC collisions. The measurements provide unequivocal evidence for a significant role played by MEC, and strongly suggest that models based solely on SEC are bound to yield erroneous conclusions on the solar wind composition and velocities and on cometary atmospheres. The experimental relative importance of MEC collisions is compared with molecular classical-over-the-barrier model (MCBM), classical trajectory Monte Carlo (CTMC), and multi-channel Landau-Zener (MCLZ), calculations which can qualitatively reproduce the experimental trends.

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PDF-file: 17 pages; size: 0.2 Mbytes

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  • Journal Name: Astrophysical Journal; Journal Volume: 629

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  • Report No.: UCRL-JRNL-212357
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 878213
  • Archival Resource Key: ark:/67531/metadc880837

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  • May 12, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 6, 2016, 2:27 p.m.

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Ali, R; Neill, P A; Beiersdorfer, P; Harris, C L; Rakovi?, M J; Wang, J G et al. On the Significance of the Contribution of Multiple-Electron Capture Processes to Cometary X-Ray Emission, article, May 12, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc880837/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.