Doubly excited circular Ba(6pj, 21c) states : e-e interaction effects in weak external fields

Doubly excited circular Ba(6pj, 21c) states : e-e interaction effects in weak external fields

The behaviour of doubly excited circular atoms in weak parallel electric and magnetic fields has been studied. The Hamiltonian, including the e-e interaction between the two excited electrons, Stark and Zeeman effects, is diagonalized in a truncated basis. The Rydberg electron, initially in a circular state, experiences a mixing of its orbital and magnetic

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...

Probing the QCD pomeron in doubly tagged e+e− collisions

We calculate the total cross-section for γγ collisions and for the process e+e− → e+e−+hadrons with two tagged leptons assuming dominance of the QCD pomeron exchange. We solve the BFKL equation including the dominant subleading effects generated by the consistency constraint which restricts the available phase-space of the emitted gluons to the region in which the virtuality of the exchanged gl...

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