Abstract
The authors present cross sections for double ionization of helium by alpha-particle impact within the independent-event model. Within this model the probability of ionizing the first electron (P1) from neutral helium is calculated in the continuum distorted-wave (CDW) approximation using an explicitly correlated wavefunction of Pluvinage (1950), whereas the probability of ionizing the second electron (P2) from the He+ ion is calculated in the CDW approximation with an eikonal initial state (CDW-EIS). The total probability for double ionization is then P1P2 rather than the P2 which is usually assumed in the independent-electron model. The calculated cross sections in the present model show excellent agreement with the measurement of Shah and Gilbody (1985), at all energies above 200 keV amu-1.
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