- Conference date: 25-28 July 2001
- Location: Rolla, Missouri (USA)
Single and multiple ionization yields, as a function of projectile energy loss and for forward scattering angles, have been measured for 750 eV positron and 800 eV electron impact on argon. Energy losses extend between zero and approximately 60% of the initial kinetic energy. For positron impact, the percentage of double ionization is found to increase rapidly for the first 80 eV of energy loss, then more slowly until the L-shell threshold. For still higher energy losses the percentage of double ionization saturates at approximately 15%. This is in excellent agreement with photo double ionization measurements. For electron impact, considerably higher amounts of multiple ionization are observed for conditions where the projectile energy loss is large.
- Collisional energy loss
- Electron energy loss spectroscopy
- Electron positron scattering
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