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    Double ionization of helium by particle impact (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Experimental results are reviewed of the ratio, R sq., of double to single ionization of He by proton, antiproton, electron and positron impact in the energy range from 0.15 to about 10 MeV/amu. At high velocities (greater than 1 to 2 MeV/amu) values of R sq. caused by electron impact merge with those for the proton with the antiproton, electron values being up to a factor of 2 greater than that for the p, positron. At these velocities the single ionization cross sections caused by impact of any of these four particles are indistinguishable.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: NASA, Goddard Space Flight Center, Annihilation in Gases and Galaxies; p 131-136
    Format: application/pdf
    Location Call Number Expected Availability
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