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Abstract: The Quantitative Rescattering Theory QRS for high-order harmonic generationHHG by intense laser pulses is presented. According to the QRS, HHG spectracan be expressed as a product of a returning electron wave packet and thephoto-recombination differential cross section of the {\em laser-free}continuum electron back to the initial bound state. We show that the shape ofthe returning electron wave packet is determined mostly by the laser only. Thereturning electron wave packets can be obtained from the strong-fieldapproximation or from the solution of the time-dependent Schr\-odinger equationTDSE for a reference atom. The validity of the QRS is carefully examined bychecking against accurate results for both harmonic magnitude and phase fromthe solution of the TDSE for atomic targets within the single active electronapproximation. Combining with accurate transition dipoles obtained fromstate-of-the-art molecular photoionization calculations, we further show thatavailable experimental measurements for HHG from partially aligned moleculescan be explained by the QRS. Our results show that quantitative description ofthe HHG from aligned molecules has become possible. Since infrared lasers ofpulse durations of a few femtoseconds are easily available in the laboratory,they may be used for dynamic imaging of a transient molecule with femtosecondtemporal resolutions.



Autor: Anh-Thu Le, R. R. Lucchese, S. Tonzani, T. Morishita, C. D. Lin

Fuente: https://arxiv.org/







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