Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 28: Attosecond physics II
A 28.8: Vortrag
Mittwoch, 16. März 2011, 12:30–12:45, BAR 205
Attosecond neutron scatterig from H2 and D2 — •C. Aris Dreismann1, Evan Gray2, and Tom Blach2 — 1Institute of Chemistry, TU Berlin, Germany — 2Griffith University, School of Biomolecular and Physical Sciences, Brisbane, Australia
Quantum entanglement (QE) has emerged as the most emblematic feature of quantum mechanics. Nuclei and electrons in condensed matter and/or molecules are usually entangled, due to the prevailing interactions. However the "environment" of a microscopic system (e.g. a proton in a H2 molecule) may cause an ultrafast decoherence thus making atomic and/or nuclear QE effects not directly accessible to experiments. Applying neutron Compton scattering (NCS) in the energy transfer range of ca. 1-100 eV, the relevant proton-neutron scattering time lies in the sub-femtosecond time range. Results of current NCS experiments from H2 and D2 in the gas phase at T = 40 K are reported, showing that the measured Compton profiles (in the attosecond scattering range) reveal new features of quantum dynamics which contradict conventional theoretical expectations. The experimental NCS setup of ISIS, Rutherford Appleton Laboratory is shortly introduced. The theoretical frame of "attosecond scattering from open quantum systems" [1] is discussed, in connection with the new experimental findings.
[1] C. A. Chatzidimitriou-Dreismann and M. Krzystyniak, Laser Physics 20, 990 (2010).