Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 25: Poster: Electron scattering and recombination
A 25.10: Poster
Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais
Spin dynamics in photoelectric effect — •Stanislav Tashenov1, Holger Jörg1, Darius Banas2, Heinrich Beier3, Carsten Brandau3, Alexandre Gumberidze3, Siegbert Hagmann3, Pierre-Michel Hillenbrand3, Ivan Kojouharov3, Christophor Kozhuharov3, Michael Lestinsky3, Yury Litvinov3, Shizu Minami3, Henning Schaffner3, Uwe Spillmann3, Thomas Stöhlker3,4, Andrey Surzhykov3,4, and Sergiy Trotsenko3 — 1Physics Institute, Heidelberg University, Germany — 2Institute of Physics, Jan Kochanowski University, Kielce, Poland — 3GSI Helmholtzzentrum, Darmstadt, Germany — 4Helmholtz-Institut Jena, Jena, Germany
Atomic photoelectric effect is the dominant mechanism in which matter absorbs electromagnetic radiation ranging from visible light up to gamma rays. At relativistic energies its dynamics must be influenced by the spin-orbit interaction – the spin of the photoelectron should precess in the field of the nucleus. However, such spin dynamics was never evidenced in the photoelectric effect. Here we show its first experimental observation. The photo effect was studied in a time-reverse process of Radiative Recombination (RR) of quasi-free electrons into the 2p3/2 state of H-like uranium ion. The RR x-ray was detected in a coincidence with the Lyα decay x-ray. This is the first observation of the correlated x-rays emitted by a heavy ion. The experiment revealed how the total orbital momentum of the final state is correlated with the directions of the incoming electron and the emitted photon.