Coulomb focusing in above-threshold ionization in elliptically polarized midinfrared strong laser fields

Liu, Chengpu; Hatsagortsyan, Karen Z.

doi:10.1103/physreva.85.023413

Cited by 38 publications

(24 citation statements)

References 48 publications

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“…Note that the peak at 1.3 meV is within our experimental resolution of 11 meV. Persistence of the “zero-peak” across various species, and its disappearance when ionizing with circularly polarized light suggests involvement of electron rescattering91011121314151617. What could the cause for the low momentum be?…”

Section: Discussionmentioning

confidence: 71%

“…Comparison of SFA, which neglects the ion's Coulomb field, with ab-initio calculations supported the assumption of the ion's Coulomb field as responsible for the modification of electron trajectories191011121314151617. Direct tunneling close to a local field maximum, even though resulting in low-energy photoelectrons (until 2 U p ; ponderomotive energy U p = E 2 /4ω 2 ; E is the peak electric field amplitude and ω the laser frequency in atomic units), is therefore seen as an unlikely cause of the LES.…”

mentioning

confidence: 78%

“…Faisal pointed out18 that forward scattering from the successive half-cycle, could be another competing channel, which should be considered. Several theoretical investigations quickly confirmed the strong contribution from forward-scattering910121416 and, therefore, identified the LES as resulting from soft recollisions modified by the interaction of the outgoing electron with the ion's Coulomb field910. Very recent calculations17 also attribute the origin of the VLES (or second order LES, as quoted in17) to soft rescattering, with the Coulomb force acting only on the radial component of the electron's motion.…”

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confidence: 91%

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Ionization with low-frequency fields in the tunneling regime

Durá

Camus

Thai

et al. 2013

Sci Rep

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Strong-field ionisation surprises with richness beyond current understanding despite decade long investigations. Ionisation with mid-IR light has promptly revealed unexpected kinetic energy structures that seem related to unanticipated quantum trajectories of the electrons. We measure first 3D momentum distributions in the deep tunneling regime (γ = 0.3) and observe surprising new electron dynamics of near-zero momentum electrons and extremely low momentum structures, below the eV, despite very high quiver energies of 95 eV. Such level of high-precision measurements at only 1 meV above the threshold, despite 5 orders higher ponderomotive energies, has now become possible with a specifically developed ultrafast mid-IR light source in combination with a reaction microscope, thereby permitting a new level of investigations into mid-IR recollision physics.

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Section: Discussionmentioning

confidence: 71%

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confidence: 78%

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confidence: 91%

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Ionization with low-frequency fields in the tunneling regime

Durá

Camus

Thai

et al. 2013

Sci Rep

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“…Only recently, indications were found of LES at a laser wavelength of 800 nm [24]. Hence, theoretical efforts concentrated on the midinfrared [25][26][27][28][29][30]. It was argued that the LES originates in the Coulomb focusing of transverse momentum components [25,26,29].…”

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confidence: 99%

Trajectory-Resolved Coulomb Focusing in Tunnel Ionization of Atoms with Intense, Elliptically Polarized Laser Pulses

et al. 2013

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Trajectory-resolved Coulomb focusing in tunnel ionization of atoms with intense, elliptically polarized laser pulsesIn strong-field light-matter interactions, the strong laser field dominates the dynamics. However, recent experiments indicate that the Coulomb force can play an important role as well. In this Letter, we have studied the photoelectron momentum distributions produced from noble gases in elliptically polarized, 800 nm laser light. By performing a complete mapping of the three-dimensional electron momentum, we find that Coulomb focusing significantly narrows the lateral momentum spread. We find a surprisingly sensitive dependence of Coulomb focusing on the initial transverse momentum distribution, i.e., the momentum at the moment of birth of the photoelectron. We also observe a strong signature of the low-energy structure in the above threshold ionization spectrum.

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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]. Analogous to the dynamics of a quantum wave packet, the collective behavior of trajectories explain the focusing of trajectories due to Coulomb effects.…”

Section: Resultsmentioning

confidence: 99%

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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Coulomb focusing in above-threshold ionization in elliptically polarized midinfrared strong laser fields

Cited by 38 publications

References 48 publications

Ionization with low-frequency fields in the tunneling regime

Ionization with low-frequency fields in the tunneling regime

Trajectory-Resolved Coulomb Focusing in Tunnel Ionization of Atoms with Intense, Elliptically Polarized Laser Pulses

Trajectory-Based Coulomb-Corrected Strong Field Approximation

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