Classical Aspects in Above-Threshold Ionization with a Midinfrared Strong Laser Field

Quan, Wei; Lin, Zhiyang; Wu, Mei‐Hwan; Kang, Hongwei; Liu, H.; Liu, Xin; Chen, J.; Liu, J.; He, X. T.; Chen, S. G.; Xiong, Hui; Guo, Liyuan; Xu, Han; Fu, Yuxi; Cheng, Ya; Xu, Zhizhan

doi:10.1103/physrevlett.103.093001

Cited by 285 publications

(220 citation statements)

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“…4.3.2, the "ionization surprise" [48]-the LES [32,33] is investigated [1]. The explanation of the LES has triggered considerable theoretical effort in several research groups [47,1,73,74,75,24].…”

Section: Resultsmentioning

confidence: 99%

“…Motivated by the experiments [32,33,81], the argon atom is initially in the 1s state with the ionization potential I p = 0.576. In the TDSE calculation, the binding potential is modeled by V(r) = −1/r − 17.0e −17.43r /r.…”

Section: Low-energy Structure [1]mentioning

confidence: 99%

“…Experiments even show qualitative deviations from the predictions of the SFA. Such examples include the Coulomb-induced enhancement of the ionization rate [12,13,14,15], four-fold symmetry violation of angle-resolved photoelectron distributions in elliptically polarized fields [16,17], forward-backward symmetry violation of momentum distributions in few-cycle linearly polarized fields [18], a central minimum with a double "horn-like" structure in parallel momentum distributions [19,20,21,22,23,24] (though its mechanism is still in debate, see, e. g., [25,26]), a cusp-like peak at zero transverse momentum distribution [19,27], radial fanning-out structures in the near-threshold regime [28,29,30,31], the low energy structure (LES) [32,33], and the below-threshold high-harmonic generation due to the binding potential [34,35].…”

Section: Introductionmentioning

confidence: 99%

“…The spectral features are analyzed with a trajectory analysis. In addition, the recently revealed "ionization surprise" [48]-the LES [32,33] in mid-infrared laser fields is investigated using the TCSFA. The TCSFA results reveal a similar ionization enhancement in the low energy regime of momentum spectra.…”

Section: Introductionmentioning

confidence: 99%

“…The Eikonal-Volkov approximation (EVA) is a theory with the aim of retaining the applicability to both fast and slow ionization [41,42,43,44]. The classical-trajectory Monte-Carlo method [45] in combination with semi-classical tunneling rates is also used to study long-range Coulomb effects on continuum electrons [46,18,33,47].…”

Section: Introductionmentioning

confidence: 99%

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Trajectory-Based Coulomb-Corrected Strong Field Approximation

Yan

Popruzhenko

Vrakking

et al. 2012

Springer Proceedings in Physics

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The strong field approximation (SFA) is a widely used theoretical tool in the field of strong field physics and has been applied to various non-perturbative ionization processes. In particular, the SFA provides an intuitive semi-classical interpretation of strong field phenomena in terms of "quantum orbits". However, recent experimental results and ab initio simulations revealed deviations from the predictions of the SFA. We have developed a systematical extension of the SFA, the trajectory-based Coulomb-corrected strong field approximation (TCSFA), to explore Coulomb effects on strong field processes.We apply the TCSFA to the ionization of hydrogen-like systems in long-wavelength, linearly polarized laser fields. Photoelectron momentum spectra are explored by comparing results from the SFA, the TCSFA and solutions of the ab initio time-dependent Schrödinger equation (TDSE). It is shown that the TCSFA yields good agreement with exact TDSE results.The TCSFA provides unprecedentedly intuitive insights into the ionization dynamics. All spectral features can be interpreted in terms of trajectories. With the aid of the TCSFA, we successfully identify new types of quantum trajectories induced by the Coulomb potential and explain the origin of the recently discovered "low-energy structure" (LES). In addition, the interferences between different types of trajectories are explored to account for diverse complex interference patterns in spectra. Within the TCSFA, it is possible to distinguish the influences on interferences from real-space and under-barrier Coulomb corrections in classically forbidden regions. Z U S A M M E N FA S S U N G Die Starkfeldnäherung (engl. "strong field approximation" (SFA)) ist ein weit verbreitetes theoretisches Hilfsmittel auf dem Gebiet der Starkfeldphysik und wurde auf verschiedene nichtstörungstheo-retische Ionisationsprozesse angewandt. Die SFA ermöglicht eine intuitive, semi-klassische Interpretation von Starkfeldphänomenen mittels "Quantenbahnen". Neuere experimentelle Resultate und ab initio-Simulationen haben allerdings Abweichungen von den SFAVorhersagen aufgezeigt. Wir haben eine systematische Erweiterung der SFA entwickelt, die trajektorien-basierte Coulomb-korrigierte Starkfeldnäherung (engl. "trajectory-based Coulomb-corrected strong field approximation" (TCSFA)), um Coulomb-Effekte in Starkfeldprozessen zu untersuchen.iii Wir wenden die TCSFA auf die Ionisation von wasserstoffartigen Systemen in langwelligen, linearpolarisierten Laserfeldern an. Photoelektronenimpulsspektren werden untersucht, in dem Resultate der SFA, der TCSFA und Lösungen der ab initio zeitabhängigen Schrödinger-Gleichung (engl. "time-dependent Schrödinger equation" (TDSE)) verglichen werden. Es wird gezeigt, dass die TCSFA gute Übereinstimmung mit den exakten TDSE-Resultaten erzielt.Die TCSFA ermöglicht bisher unerreichte, intuitive Einsichten in die Ionisationsdynamik. Alle spektralen Eigenschaften können mittels Trajektorien interpretiert werden. Mit Hilfe der TCSFA kön-nen wir erfolgreich neue Typen von ...

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