Doubly excited states in some light atoms

Scattering of light exotic atoms in excited states

The differential and total cross sections for the scattering of muonic, pionic, kaonic and antipro-tonic hydrogen in excited states from atomic hydrogen have been calculated for the purpose of atomic cascade calculations. The scattering problem is treated in a fully quantum mechanical framework which takes the energy shifts and, in the case of the hadronic atoms, the widths of the ns states int...

Synchrotron Radiation/lasers and Doubly-excited Atoms

This report highlights a series of joint theoretical and experimental collaborations which started over ten years ago in Taiwan. The recent topic program Synchrotron Radiation and Multiply-excited Atoms, sponsored by the National Center for Theoretical Sciences (NCTS) at Tsinghua University in Hsinchu and organized by K. T. Chung and C. S. Hsu, o®ers an excellent opportunity for many of us to w...

On doubly excited states in negative ions

Atomic negative ions are fragile quantum systems with a binding energy one order of magnitude smaller than for atoms. Due to this weak binding, correlation among the valence electrons plays a very important role. For doubly excited states, where two electrons are simultaneously promoted, correlation becomes dominant and is thus no longer a small perturbation to the independent particle behaviou...

Autodetachment of doubly excited states in nonhydrogenic negative ions.

A semiclassical model is developed to describe the two-electron dynamics of the process of autodetachment. A formula derived for the partial width of a doubly excited state represents a product of an amplitude and phase factors. An anomalous width behavior is predicted for states near a threshold when the orbital angular momentum of the outer electron is high. Oscillations of the phase factor, ...

Novel Doubly Excited States Produced in Negative Ion Photodetachment