Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 16: Photoionization
A 16.4: Vortrag
Dienstag, 19. März 2013, 11:45–12:00, F 428
The transition from coherent behavior to random order — •Rainer Hentges1, Toralf Lischke2, Gregor Hartmann2, Burkhard Langer3, Arno Ehresmann1, and Uwe Becker2 — 1Institut für Physik, Universität Kassel Heinrich-Plett-Str. 40, 34132 Kassel, Germany — 2Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany — 3Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany
One of the basic discoveries of quantum physics regarding the properties of nature was the duality of wave like and particle like behavior. Wave like behavior is determined by coherent superpositions of wave like quantum objects, whereas particle like behavior follows the rules of classical mechanics rather than the rules of quantum mechanics. Following quantum mechanics the outcome of measurements in this regime would be random. One of the most beautiful example in this respect is Wheelers ”delayed choice experiment” realized for the first time only some years ago by the group of Alain Aspect.
We studied a similar problem in the context of photoionization. The transition from coherent behavior to random order is the transition from coherent determinism in form of interference pattern to non-coherent but ”which way” carrying pattern, the regime of random order. In between these two regimes is another regime, the ”coherent order” regime which will be discussed in more detail in the talk.