Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Attosecond Physics I
A 15.2: Vortrag
Mittwoch, 10. März 2010, 16:45–17:00, F 107
Emission times in high-order harmonic generation — Ciprian Constantin Chirila1, Ingo Dreissigacker1, •Elmar Vincent van der Zwan1,2, and Manfred Lein1 — 1Centre for Quantum Engineering and Space-Time Research (QUEST) and Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany — 2Institut für Physik, Universität Kassel, Heinrich-Plett-Str. 40, 31432 Kassel, Germany
We calculate the emission times of the radiation in high-order harmonic generation using the Gabor transform of numerical data obtained from solving the time-dependent Schrödinger equation in one, two, and three dimensions. Both atomic and molecular systems, including nuclear motion, are investigated. Lewenstein model calculations are used to gauge the performance of the Gabor method. The resulting emission times are compared against the classical simple-man’s model as well as against the more accurate quantum-orbit model based on complex trajectories. The influence of the range of the binding potential (long or short) on the level of agreement is assessed. Our analysis reveals that the short-trajectory harmonics are emitted slightly earlier than predicted by the quantum-orbit model. This explains partially recent experimental observations for atoms and molecules [1]. Furthermore, we observe a distinct signature of two-center interference in the emission times for H2 and D2. Model calculations show the effect of the laser-induced bound-state dynamics on this interference.
[1] S. Hässler et al., J. Phys. B 42, 134002 (2009)