Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster: Interaction of matter and collisions with ions

A 26.3: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Vortices associated with the wavefunction of a single electron emitted in slow ion-atom collisions — •Lothar Ph. H. Schmidt¹, Christoph Goihl¹, Daniel Metz¹, Horst Schmidt-Böcking¹, Reinhard Dörner¹, Serge Yu. Ovchinnikov^2,3, Joseph H. Macek³, and David R. Schultz² — ¹Goethe-Universität Frankfurt am Main — ²University of North Texas, Denton — ³University of Tennessee, Knoxville

Using COLTRIMS we measured the momentum distribution of electrons emitted during slow ion-atom collisions He²⁺ + He → He⁺ + He²⁺ + e⁻. At large scattering angles above 2 mrad it shows rich structures which have not been seen in earlier experiments. They arise from two-electron states absent in an independent electron picture of the transfer ionization process. Our calculations reveal that minima in the measured distributions are zeroes in the electronic probability density resulting from vortices in the electronic current.