Details
| Original language | English |
|---|---|
| Article number | 065003 |
| Journal | New Journal of Physics |
| Volume | 14 |
| Publication status | Published - 1 Jun 2012 |
Abstract
In this paper autoionizing states in the one-dimensional helium atom are investigated by numerical solution of the time-dependent twoelectron 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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: New Journal of Physics, Vol. 14, 065003, 01.06.2012.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Probing Fano resonances with ultrashort pulses
AU - Zhao, Jing
AU - Lein, Manfred
PY - 2012/6/1
Y1 - 2012/6/1
N2 - In this paper autoionizing states in the one-dimensional helium atom are investigated by numerical solution of the time-dependent twoelectron 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.
AB - In this paper autoionizing states in the one-dimensional helium atom are investigated by numerical solution of the time-dependent twoelectron 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.
UR - http://www.scopus.com/inward/record.url?scp=84862595199&partnerID=8YFLogxK
U2 - 10.1088/1367-2630/14/6/065003
DO - 10.1088/1367-2630/14/6/065003
M3 - Article
AN - SCOPUS:84862595199
VL - 14
JO - New Journal of Physics
JF - New Journal of Physics
SN - 1367-2630
M1 - 065003
ER -