Abstract
In this work we present a correlated wave function for a three-body continuum Coulomb problem. This state is described by the two-variables Φ2 hypergeometric function. We examine the properties of this function and their differences with previous uncorrelated models. The Φ2 wave function can be considered as a final state of ion–atom ionizing collisions, giving rise to both undistorted (Born-Φ2) and distorted (EIS-Φ2) models. We obtain double differential cross sections with the Born-Φ2 theory for proton–helium collisions in the intermediate to high energy regime. They exhibit all the main features of the electronic emission process and agree with the experimental data.
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