Double and single ionization of He and H{sub 2} by slow protons and antiprotons

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Double and single ionization of He and H{sub 2} by proton (p) and antiproton ({bar p})impact in the energy region below 50 keV was studied theoretically by using the semiclassical molecular picture. As the energy decreased, the ratio of the double- to the single-ionization cross section increased for impact and decreased for p impact for both He and H{sub 2}. These trends are consistent with recent measurements for He. Ionization mechanisms differ distinctly for p impact and {bar p} impact. For p impact, the dominant mechanism for double ionization at the lower energies is sequential ladder climbing by the two ... continued below

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4 p.

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Kimura, Mineo; Shimamura, Isao & Inokuti, Mitio December 31, 1994.

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  • Kimura, Mineo Rice Univ., Houston, TX (United States). Dept. of Physics
  • Shimamura, Isao Riken, Inc., Wako, Saitama (Japan). Institute of Physical and Chemical Research
  • Inokuti, Mitio Argonne National Lab., IL (United States)

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Double and single ionization of He and H{sub 2} by proton (p) and antiproton ({bar p})impact in the energy region below 50 keV was studied theoretically by using the semiclassical molecular picture. As the energy decreased, the ratio of the double- to the single-ionization cross section increased for impact and decreased for p impact for both He and H{sub 2}. These trends are consistent with recent measurements for He. Ionization mechanisms differ distinctly for p impact and {bar p} impact. For p impact, the dominant mechanism for double ionization at the lower energies is sequential ladder climbing by the two electrons through various excited channels and finally into the continuum. For {bar p} impact, in contrast, the approaching negative charge distorts both the He and H{sub 2} electron clouds toward the other side of the nucleus and decreases the electron binding energies. These effects enhance electron-electron interactions, increasing double ionization. For the H{sub 2}, an effect of molecular orientation is an additional complication in determining the dynamics.

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4 p.

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INIS; OSTI as DE95005828

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  • 4. U.S./Mexico joint symposium on atomic and molecular physics, San Juan Del Rio (Mexico), 7-10 Dec 1994

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  • Other: DE95005828
  • Report No.: ANL/ER/CP--85213
  • Report No.: CONF-941268--3
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 92093
  • Archival Resource Key: ark:/67531/metadc794103

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  • December 31, 1994

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  • Dec. 19, 2015, 7:14 p.m.

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  • Jan. 6, 2016, 3 p.m.

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Kimura, Mineo; Shimamura, Isao & Inokuti, Mitio. Double and single ionization of He and H{sub 2} by slow protons and antiprotons, article, December 31, 1994; Illinois. (digital.library.unt.edu/ark:/67531/metadc794103/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.