Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 1: Interaction with strong or short laser pulses I
A 1.4: Vortrag
Montag, 12. März 2012, 11:30–11:45, V55.01
The Impact of Multichannel and Multipole Effects on the Cooper Minimum in the High-Harmonics Spectrum of Argon — •Stefan Pabst1,2, Loren Greenman3, David A. Mazziotti3, and Robin Santra1,2 — 1Center for Free-Electron Laser Science, DESY, Hamburg, Germany — 2Department of Physics, University of Hamburg, Germany — 3Department of Chemistry and The James Franck Institute, The University of Chicago, Chicago, USA
We investigate the relevance of multiple-orbital and multipole effects during high-harmonic generation (HHG). The time-dependent configuration-interaction singles (TDCIS) approach is used to study the impact of the detailed description of the residual electron-ion interaction on the HHG spectrum. We find that the shape and position of the Cooper minimum in the HHG spectrum of argon changes significantly whether or not interchannel interactions are taken into account. We show that the argument of low ionization probability is not sufficient to justify ignoring multiple-orbital contributions. When additionally the tensorial character of the electron-ion interaction is neglected and a spherically symmetric electron-ion interaction is assumed, we find that the HHG yield is underestimated by up to 2 orders of magnitude in the energy range of 20-40 eV, thus modifying the shape of the Cooper minimum significantly.