High-order Harmonic Spectroscopy of the Cooper Minimum in Argon: Experimental and Theoretical Study

Details High-order Harmonic Spectroscopy of the Cooper Minimum in Argon: Experimental and Theoretical Study High-order Harmonic Spectroscopy of the Cooper Minimum in Argon: Experimental and Theoretical Study

2010-12-13

arxiv.org/abs/1012.2676v1

Physics

Atomic Physics

13 pages

Scientific paper

We study the Cooper minimum in high harmonic generation from argon atoms using long wavelength laser pulses. We find that the minimum in high harmonic spectra is systematically shifted with respect to total photoionization cross section measurements. We use a semi-classical theoretical approach based on Classical Trajectory Monte Carlo and Quantum Electron Scattering methods (CTMC-QUEST) to model the experiment. Our study reveals that the shift between photoionization and high harmonic emission is due to several effects: the directivity of the recombining electrons and emitted polarization, and the shape of the recolliding electron wavepacket.

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