RECOIL-INDUCED ELECTRONIC EXCITATION AND IONIZATION IN ONE-ELECTRON AND 2-ELECTRON IONS

The electronic redistribution of an ion or atom induced by a sudden re coil of the nucleus occurring during the emission or capture of a neut ral particle is theoretically investigated. For one-electron systems, analytical expressions are derived for the electronic transition proba bilities to bound and continuum states. The quality of a B-spline basi s set approach is evaluated from a detailed comparison with the analyt ical results. This numerical approach is then used to study the dynami cs of two-electron systems (neutral He and Ne8+) using correlated wave functions for both the target and daughter ions. The total transition probabilities to discrete states, autoionizing states and direct singl e-and double-ionization probabilities are calculated from the pseudosp ectra. Sum rules for transition probabilities involving an initial bou nd state and a complete final series are discussed.