Mechanism of laser-induced double ionization of helium

Becker, Andreas; Faisal, Farhard

doi:10.1088/0953-4075/29/6/005

Cited by 162 publications

(112 citation statements)

References 19 publications

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“…Unfortunately, the underlying mechanism for this process remains unclear, but various theoretical twoelectron [17,18] treatments have begun. However, we emphasize that the results we have presented bet ter defines the underlying dynamics of these processes and provides more stringent limits on any future models.…”

Section: Resultsmentioning

confidence: 99%

Single and multiple electron dynamics in the strong field limit

Sheehy¹,

Walker²,

Lafon³

et al. 1996

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Abstract.High precision photoelectron energy and angular distributions in helium and neon atoms for a broad intensity range reflect the change in the continuum dynamics that occurs as the ionization process evolves into the pure tunneling regime. Elastic rescattering of the laser-driven free electron from its parent ion core leaves a distinct signature on the spectra, providing a direct quantitative test of the various theories of strong field multiphoton ionization. We show that it takes a relatively complete semi-classical rescattering model to accurately reproduce the observed photoelectron distributions. However, the calculated inelastic rescattering rate fails to reproduce the measured nonsequential double ionization yields.,,

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Section: Resultsmentioning

confidence: 99%

Single and multiple electron dynamics in the strong field limit

Sheehy¹,

Walker²,

Lafon³

et al. 1996

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“…The strong field approximation (SFA) is a widely used theoretical approach to tackle field-atom or field-molecule interaction in the nonperturbative regime, as well as high-order harmonic generation (also known as the Lewenstein model) [49], and non-sequential double ionization [50,51,52,53,54,55]. In this Chapter, we provide a consistent introduction to basic concepts of strong field physics and the SFA.…”

Section: S T R O N G F I E L D a P P R O X I M At I O Nmentioning

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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“…A plausible model relevant for the field intensities of the experiments is the rescattering mechanism [11][12][13][14][15][16][17][18]. Before the pulse arrives, the atom is in its ground state.…”

Section: The Modelmentioning

confidence: 99%

Classical Analysis of Correlated Multiple Ionization in Strong Fields

Eckhardt

Sacha

2001

Quantum Chaos Y2K

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We discuss the final stages of the simultaneous ionization of two or more electrons due to a strong laser pulse. An analysis of the classical dynamics suggests that the dominant pathway for non-sequential escape has the electrons escaping in a symmetric arrangement. Classical trajectory models within and near to this symmetry subspace support the theoretical considerations and give final momentum distributions in close agreement with experiments.

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Mechanism of laser-induced double ionization of helium

Cited by 162 publications

References 19 publications

Single and multiple electron dynamics in the strong field limit

Single and multiple electron dynamics in the strong field limit

Trajectory-Based Coulomb-Corrected Strong Field Approximation

Classical Analysis of Correlated Multiple Ionization in Strong Fields

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