Electron correlation and short-range dynamics in attosecond angular streaking

Armstrong, Gregory; Clarke, Daniel D. A.; Benda, Jakub; Brown, A. C.; Hart, H. W. van der

doi:10.1103/physreva.101.041401

Cited by 11 publications

(6 citation statements)

References 37 publications

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“…Among the methods capable of accurate description of multielectron dynamics in strong fields is the wellestablished ab initio R-matrix with time-dependence approach (RMT) [20,21]. Until now, RMT has been applied only to processes involving atoms and used to model high harmonic generation [22], to analyze angular distributions of photoelectron momentum in complicated field configurations, including pairs of counterrotating circularly polarized short laser pulses [23,24] and angular streaking [25], and even to processes involving spin-orbit interactions [26]. We note that an alternative implementation of RMT has been applied to H 2 + [27].…”

Section: Introductionmentioning

confidence: 99%

Perturbative and nonperturbative photoionization of H2 and H2O using the molecular R<

et al. 2020

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The ab initio R-matrix with time method has recently been extended to allow simulation of fully nonperturbative multielectron processes in molecules driven by ultrashort arbitrarily polarized strong laser fields. Here we demonstrate the accuracy and capabilities of the current implementation of the method for two targets: We study single-photon and multiphoton ionization of H 2 and one-photon and strong-field ionization of H 2 O and compare the results to available experimental and theoretical data as well as our own time-independent R-matrix calculations. We obtain a highly accurate description of total and state-to-state single-photon ionization of H 2 O and, using a simplified coupled-channel model, we show that state coupling is essential to obtain qualitatively correct results and that its importance as a function of laser intensity changes. We find that electron correlation plays a more important role at low intensities (up to approximately 50 TW/cm 2).

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Section: Introductionmentioning

confidence: 99%

Perturbative and nonperturbative photoionization of H2 and H2O using the molecular R<

et al. 2020

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“…The effect would, however, disappear in the strong-field ionization of a negative ion such as F − , as we originally proposed in [26]. This scenario was recently revisited in a fully correlated approach by Armstrong et al [27] using the R-matrix with timedependence (RMT) method. As a final complication, the offset angle in a Coulomb field actually depends on the definition of this angle itself.…”

Section: Introductionmentioning

confidence: 90%

Photoelectron momentum distributions in the strong-field ionization of atomic hydrogen by few-cycle elliptically polarized optical pulses

Douguet

Bartschat

2022

Phys. Rev. A

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We investigate the strong-field ionization of atomic hydrogen in a few-cycle elliptically polarized infrared pulse by solving the time-dependent Schrödinger equation. The dependence of the photoelectron momentum distribution on the pulse intensity, ellipticity, length, envelope, and carrier envelope phase is analyzed. In particular, we explain the variation of the electron offset angle with asymptotic electron energy through the combined action of the field and the Coulomb potential, and demonstrate that low-ellipticity pulses make it possible to access the electron release time.

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“…where γ 0 , γ ±1 ∈ C and include information about the relative amplitudes of the dierent angular parts. The expression (9) implies that the PMD in the polarization plane is invariant under a two-fold rotation around the axis perpendicular to the xz-plane, i. e., the y-axis, and therefore, γ −1 = γ 1 . However, the PMD in the polarization plane are slightly asymmetric, that is to say, γ −1 6 = γ 1 [47,48] and similarly for terms with higher values of odd ℓ.…”

Section: Photoelectron Spectrum Asymmetrymentioning

confidence: 99%

Photoionization of aligned excited states in neon by attosecond laser pulses

Omiste¹,

Madsen²

2021

J. Phys. B: At. Mol. Opt. Phys.

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We numerically describe the ionization process induced by linearly and circularly polarized extreme ultraviolet (XUV) attosecond laser pulses on an aligned atomic target, specifically the excited state Ne*(1s 22s 22p 5[ P o 2 1 / 2 ]3s[ P o 1 ]). We compute the excited atomic state by applying the time-dependent restricted-active-space self-consistent field method to fully account for the electronic correlation. We find that correlation-assisted ionization channels can dominate channels accessible without correlation. We also observe that the rotation of the photoelectron momentum distribution by circularly polarized laser pulses compared to the case of linear polarization can be explained in terms of differences in accessible ionization channels. This study shows that it is essential to include electron correlation effects to obtain an accurate description of the photoelectron emission dynamics from aligned excited states.

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Electron correlation and short-range dynamics in attosecond angular streaking

Cited by 11 publications

References 37 publications

Perturbative and nonperturbative photoionization of H2 and H2O using the molecular R<

Perturbative and nonperturbative photoionization of H2 and H2O using the molecular R<

Photoelectron momentum distributions in the strong-field ionization of atomic hydrogen by few-cycle elliptically polarized optical pulses

Photoionization of aligned excited states in neon by attosecond laser pulses

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