Polarization tagging of two-photon double ionization by elliptically polarized XUV pulses

Donsa, Stefan; Březinová, Iva; Ni, Hongcheng; Feist, Johannes; Burgdörfer, Joachim

doi:10.1103/physreva.99.023413

Cited by 14 publications

(10 citation statements)

References 57 publications

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“…To probe for the possible influence of electron correlation and exclude possible shortcomings of the SAE approximation, we additionally perform full ab initio simulations using the time-dependent close coupling method [39] on a spatial FEDVR grid [40] thereby solving the full two-electron TDSE for atomic helium from first principles [41,42]. The electric fields are treated in the dipole approximation.…”

Section: Theoretical Resultsmentioning

confidence: 99%

Time delays from one-photon transitions in the continuum

Fuchs¹,

Douguet²,

Donsa³

et al. 2020

Optica

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Attosecond photoionisation time delays reveal information about the potential energy landscape an outgoing electron wavepacket probes upon ionisation. In this study we experimentally quantify, for the first time, the dependence of the time delay on the angular momentum of the liberated photoelectrons. For this purpose, electron quantum-path interference spectra have been resolved in energy and angle using a two-color attosecond pump-probe photoionisation experiment in helium. A fitting procedure of the angle-dependent interference pattern allows us to disentangle the relative phase of all four quantum pathways that are known to contribute to the final photoelectron signal. In particular, we resolve the dependence on the angular momentum of the delay of one-photon transitions between continuum states, which is an essential and universal contribution to the total photoionization delay observed in attosecond pump-probe measurements. For such continuumcontinuum transitions, we measure a delay between outgoing s-and d-electrons as large as 12 as close to the ionisation threshold in helium. Both single-active-electron and first-principles ab initio simulations confirm this observation for helium and hydrogen, demonstrating the universality of the observed delays.Recently, experimental evidence of a strong effect of the IR-induced cc-transitions on the angular dependence of the total photoemission delays has been reported [14,15] stimulating several independent investigations on the origin of this effect [21,[23][24][25][26][27]. In this work, arXiv:1907.03607v1 [physics.atom-ph]

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Section: Theoretical Resultsmentioning

confidence: 99%

Time delays from one-photon transitions in the continuum

Fuchs¹,

Douguet²,

Donsa³

et al. 2020

Optica

Self Cite

View full text Add to dashboard Cite

show abstract

“…To probe for the possible influence of electron correlation and exclude possible shortcomings of the SAE approximation, we additionally perform full ab initio simulations using the timedependent close-coupling method [41] on a spatial finite element discrete variable representation grid [42], thereby solving the full two-electron TDSE for atomic helium from first principles [43,44]. The electric fields are treated in the dipole approximation.…”

Section: Theoretical Resultsmentioning

confidence: 99%

Time delays from one-photon transitions in the continuum

Fuchs

Douguet

Donsa

et al. 2020

Conference on Lasers and Electro-Optics

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Attosecond photoionization time delays reveal information about the potential energy landscape that an outgoing electron wavepacket probes upon ionization. In this study, we experimentally quantify the dependence of the time delay on the angular momentum of the liberated photoelectrons. For this purpose, we resolved electron quantum-path interference spectra in energy and angle using a two-color attosecond pump-probe photoionization experiment in helium. A fitting procedure of the angle-dependent interference pattern allows us to disentangle the relative phase of all four quantum pathways that are known to contribute to the final photoelectron signal. In particular, we resolve the dependence on angular momentum of the delay of one-photon transitions between continuum states, which is an essential and universal contribution to the total photoionization delay observed in attosecond pump-probe measurements. For such continuum-continuum transitions, we measure a delay between outgoing s and d electrons as large as 12 attoseconds, close to the ionization threshold in helium. Both single-active-electron and first-principles ab initio simulations confirm this observation for helium and hydrogen, demonstrating the universality of the observed delays. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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“…However, these calculations typically required enormous computational resources-an entire supercomputer, in fact-using all 16,000 cores available at that time on the UK's national highend computing platform (HECToR). Following the literature over the next few years, I noted the development of a number of similar approaches [154][155][156][157][158][159][160][161][162]. In NSDI applications in particular, I was struck by the significant progress made in reducing the scale of such calculations by the tsurff method [58,[163][164][165].…”

Section: Full-dimensional Numerical Solution Of the Tdsementioning

confidence: 99%

Dialogue on analytical and ab initio methods in attoscience

et al. 2021

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The perceived dichotomy between analytical and ab initio approaches to theory in attosecond science is often seen as a source of tension and misconceptions. This Topical Review compiles the discussions held during a round-table panel at the ‘Quantum Battles in Attoscience’ cecam virtual workshop, to explore the sources of tension and attempt to dispel them. We survey the main theoretical tools of attoscience—covering both analytical and numerical methods—and we examine common misconceptions, including the relationship between ab initio approaches and the broader numerical methods, as well as the role of numerical methods in ‘analytical’ techniques. We also evaluate the relative advantages and disadvantages of analytical as well as numerical and ab initio methods, together with their role in scientific discovery, told through the case studies of two representative attosecond processes: non-sequential double ionisation and resonant high-harmonic generation. We present the discussion in the form of a dialogue between two hypothetical theoreticians, a numericist and an analytician, who introduce and challenge the broader opinions expressed in the attoscience community.

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Polarization tagging of two-photon double ionization by elliptically polarized XUV pulses

Cited by 14 publications

References 57 publications

Time delays from one-photon transitions in the continuum

Time delays from one-photon transitions in the continuum

Time delays from one-photon transitions in the continuum

Dialogue on analytical and ab initio methods in attoscience

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