Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 12: Ultracold plasmas and Rydberg systems I (with Q)

A 12.3: Vortrag

Montag, 29. Februar 2016, 17:30–17:45, f303

Electron pair formation in He (Cooper pair) — •Hubert Klar — DHBW Lörrach

The empirical shell modell for atoms predicts for two-electron atoms an infinity of high double Rydberg states of the form He(nl,n'l'). A ficticiuos force presented in this conference elsewhere, however, distroys this oversimplified picture. In e-He+(nl) scattering we observe a spontanious time-reversal symmetry breaking. The incoming wavefront is turned towards the top of a potential ridge which leads to an e-e attraction. A Cooper pair is born. After reflection at a centrifugal barrier the outgoing wave diverges from the ridge. Slightly below the threshold for double escape the wave may be reflected at an outer barrier or slightly above threshold the Cooper pair decays immediately. Our quantum mechanical result compares favorably with Wannier's classical ionization theory and with experimental data.