Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

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

A 26.1: Poster

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

Momentum transfer to a free floating double slit: Realization of a thought experiment from the Einstein-Bohr debates — •Lothar Ph. H. Schmidt, Till Jahnke, Sven Schößler, Markus Schöffler, Adrian Messen, Horst Schmidt-Böcking, and Reinhard Dörner — Goethe-Universität Frankfurt am Main, Germany

In one of the most famous physics debates ever Einstein challenged Bohr and the then new quantum mechanics in 1927 with a thought experiment. He proposed that measuring the momentum transfer to a double slit would unveil through which of the two slits the quantum particle had passed. We translate this experiment finally to experimental reality using an isotope labeled free floating diatomic molecular ion as the double pinhole. The reaction HD⁺ + He → H + D + He⁺ was measured in a kinematically complete experiment by using COLTRIMS. We find that the Helium does not only travel delocalized through both slits, but even more counter intuitive and completely opposite to Einstein‘s assumption, it transfers momentum to both slits simultaneously.