Abstract
Recent electron-impact double ionization (e, 3 - 1e) experiments on helium are investigated theoretically. An ab initio calculation has been performed on the basis of the first Born approximation using different correlated wavefunctions for the initial bound-state and a correlated double-continuum wavefunction which satisfies the exact asymptotic boundary conditions for the final state with two slow electrons. The results of this calculation are compared with those of other theories.
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