Probing Fano resonances with ultrashort pulses

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Zhao, Jing; Lein, Manfred: Probing Fano resonances with ultrashort pulses. In: New Journal of Physics 14 (2012), 65003. DOI: https://doi.org/10.1088/1367-2630/14/6/065003

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Sum total of downloads: 159




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Abstract: 
In this paper, autoionizing states in the one-dimensional helium atom are investigated by numerical solution of the time-dependent two-electron Schrodinger equation. The atom is irradiated by an extreme ultraviolet (XUV) attosecond pulse and a time-delayed infrared few-cycle laser pulse. The XUV pulse populates a superposition of doubly excited states, leading to Fano resonances in the photoelectron spectrum. It is demonstrated that the Fano line profile is strongly modified by the presence of the laser field. Laser-induced coupling between the different doubly excited states causes the population of autoionizing states that cannot be reached by absorbing a single XUV photon from the ground state. The resulting additional peaks in the photoelectron spectrum are modulated as a function of time delay. Furthermore, the photoelectron spectrum exhibits a fringe pattern that is determined by the time delay but is independent of the details of the laser pulse.
License of this version: CC BY-NC-SA 3.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2012
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
total perc.
1 image of flag of Germany Germany 122 76.73%
2 image of flag of United States United States 16 10.06%
3 image of flag of China China 12 7.55%
4 image of flag of Taiwan Taiwan 1 0.63%
5 image of flag of Japan Japan 1 0.63%
6 image of flag of Italy Italy 1 0.63%
7 image of flag of Hungary Hungary 1 0.63%
8 image of flag of Hong Kong Hong Kong 1 0.63%
9 image of flag of Greece Greece 1 0.63%
10 image of flag of Brazil Brazil 1 0.63%
    other countries 2 1.26%

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