Real-Time Observation of Interference between Atomic One-Electron and Two-Electron Excitations

Geiseler, Henning; Rottke, H.; Zhavoronkov, N.; Sandner, W.

doi:10.1103/physrevlett.108.123601

Cited by 11 publications

(7 citation statements)

References 19 publications

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“…It can be easily verified that the oscillation as a function of delay has a period of about 2.4 fs, in agreement with the energy gap between the states |2, 3 and |2, 5 . This type of oscillation for coherent excitation of two resonances has already been pointed out in [7] and measured experimentally [9]. It corresponds to the quasi-periodic motion apparent in the coordinate-space plots in figures 2(a)-(c).…”

Section: Resultssupporting

confidence: 77%

“…Over the last few years, the dynamical properties of Fano resonances caused by autoionization of metastable states have been investigated [6][7][8][9]. Doubly excited states lying above the one-electron ionization threshold are prime examples of autoionizing states.…”

Section: Introductionmentioning

confidence: 99%

“…In our simulations, a single attosecond XUV pulse with broad bandwidth creates a wave packet consisting of several doubly excited states. The simultaneous XUV-induced population of different autoionizing states has been addressed only rarely in the literature [3,7,9,17]. A time-delayed NIR laser pulse probes the autoionization dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Probing Fano resonances with ultrashort pulses

Zhao

Lein

2012

New J. Phys.

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In this paper, autoionizing states in the one-dimensional helium atom are investigated by numerical solution of the time-dependent twoelectron Schrödinger 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. Contents

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

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Probing Fano resonances with ultrashort pulses

Zhao

Lein

2012

New J. Phys.

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“…By the development of such high-intensity attosecond X-ray sources, the realm of ultrafast processes that can be explored will be greatly extended. The imaging of a single molecule [11], the real time tracking of electron distribution around atoms and molecules [12,13], and the dynamical investigation of X-ray nonlinear processes [14] are a few examples among the investigations that will set milestones. Therefore, the generation of attosecond X-ray pulses has drawn…”

Section: Introductionmentioning

confidence: 99%

Terawatt-Isolated Attosecond X-ray Pulse Using a Tapered X-ray Free Electron Laser

2017

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High power attosecond (as) X-ray pulses are in great demand for ultrafast dynamics and high resolution microscopy. We numerically demonstrate the generation of a~230 attosecond, 1.5 terawatt (TW) pulse at a photon energy of 1 keV, and a 115 attosecond, 1.2 TW pulse at a photon energy of 12.4 keV, using the realistic electron beam parameters such as those of Korean X-ray free electron laser (XFEL) in a tapered undulator configuration. To compensate the energy loss of the electron beam and maximize its radiation power, a tapering is introduced in the downstream section of the undulator. It is found that the tapering helps in not only amplifying a target radiation pulse but also suppressing the growth of satellite radiation pulses. Tapering allows one to achieve a terawatt-attosecond pulse only with a 60 m long undulator. Such an attosecond X-ray pulse is inherently synchronized to a driving optical laser pulse; hence, it is well suited for the pump-probe experiments for studying the electron dynamics in atoms, molecules, and solids on the attosecond time-scale. For the realization of these experiments, a high level of synchronization up to attosecond precision between optical laser and X-ray pulse is demanded, which can be possible by using an interferometric feedback loop.

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“…Fano resonances are a broad class of resonances that can occur during photoionization or photorecombination due to electron-electron interaction [12][13][14][15]. They can result from the interference between a continuum state * chunmei.zhang@uottawa.ca and a bound doubly excited state that is embedded in the continuum [16].…”

mentioning

confidence: 99%

Characterizing Fano Resonances During Recollision

Brown,

Ko,

Zhang

et al. 2020

Preprint

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Real-Time Observation of Interference between Atomic One-Electron and Two-Electron Excitations

Cited by 11 publications

References 19 publications

Probing Fano resonances with ultrashort pulses

Probing Fano resonances with ultrashort pulses

Terawatt-Isolated Attosecond X-ray Pulse Using a Tapered X-ray Free Electron Laser

Characterizing Fano Resonances During Recollision

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