Two-step amplitudes in which the Coulomb interaction of the ejected $\beta$ electron excites the bound atomic electron into $S$ and $P$ states are calculated. Probabilities for excited states of the residual helium ion are changed by less than 0.24% from the sudden approximation.

• Received 23 January 1984

DOI:https://doi.org/10.1103/PhysRevC.29.2365