Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 28: Attosecond physics II
A 28.2: Vortrag
Mittwoch, 16. März 2011, 11:00–11:15, BAR 205
Decoherence in Attosecond Photoionization — •Stefan Pabst1,2, Loren Greenman3, Phay J. Ho4, David A. Mazziotti4, and Robin Santra1,2 — 1Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607 Hamburg, Germany — 2Department of Physics,University of Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany — 3Department of Chemistry and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA — 4Argonne National Laboratory, Argonne, Illinois 60439, USA
The creation of superpositions of hole states via single-photon ionization using attosecond extreme-ultraviolet pulses is studied with the time-dependent configuration interaction singles (TDCIS) method. Specifically, the degree of coherence between hole states in atomic xenon is investigated. We find that interchannel coupling not only affects the hole populations, it also enhances the entanglement between the photoelectron and the remaining ion, thereby reducing the coherence within the ion. As a consequence, even if the spectral bandwidth of the ionizing pulse exceeds the energy splittings among the hole states involved, perfectly coherent hole wave packets cannot be formed. For sufficiently large spectral bandwidth, the coherence can only be increased by increasing the mean photon energy.