A NEW THEORETICAL METHOD FOR COLLISIONS WITH CORRELATED ATOMS
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abstract
In the past decade we have developed new numerical methods for describing ion-atom collisions. We have previously limited ourselves to those systems where it is accurate to treat the projectile-target trajectory classically and the motion of the electrons in the static independent particle model. We have shown that this reduces to solving the time dependent perturbation of a single-electron atom, with of course the proviso that one must calculate all the relevant single-particle amplitudes that describe the states of interest. We have now developed an efficient new method for including electron-electron correlations exactly. This method and its application to two-electron collision systems will be described in detail. We discuss preliminary results for p + He collisions, where experiments show an intriguing difference between the proton and equal velocity electron double ionization cross sections. 1985.