Physics – Atomic Physics
Scientific paper
2012-02-22
Phys. REv. A 85, 023411 (2012)
Physics
Atomic Physics
9 pages, 4 figures
Scientific paper
10.1103/PhysRevA.85.023411
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. The HHG yield can be underestimated by up to 2 orders of magnitude in the energy regio of 30-50 eV. We show that the argument of low ionization probability is not sufficient to justify ignoring multiple-orbital contributions. Additionally, we find the HHG yield is sensitive to the nonspherical multipole character of the electron-ion interaction.
Greenman Loren
Mazziotti David A.
Pabst Stefan
Santra Robin
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