Effect of electron correlations on attosecond photoionization delays in the vicinity of the Cooper minima of argon

A. Bray; A. Kheifets; C. F. Perry; D. Hammerland; H. J. Woerner; I. Seres; K. Osvay; P. Jojart; P. Zhang; S. Kuehn

arxiv: 1907.01219 · v1 · pith:5NTRONGJnew · submitted 2019-07-02 · ⚛️ physics.atom-ph

Effect of electron correlations on attosecond photoionization delays in the vicinity of the Cooper minima of argon

D. Hammerland , P. Zhang , A. Bray , C. F. Perry , S. Kuehn , P. Jojart , I. Seres , V. Zuba

show 5 more authors

Z. Varallyay K. Osvay A. Kheifets T. T. Luu H. J. Woerner

This is my paper

Pith reviewed 2026-05-25 11:03 UTC · model grok-4.3

classification ⚛️ physics.atom-ph

keywords photoionization delaysattosecond physicselectron correlationsCooper minimumargonphotoelectron spectroscopymany-body effects

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The pith

Electron correlations in argon produce photoionization delays up to 430 attoseconds near a Cooper-like minimum.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper measures attosecond photoionization delays in argon near 42 eV, where the 3s channel shows a Cooper-like minimum caused only by correlations with the 3p shell. Single-particle models miss this minimum entirely. Using a 100 kHz high-repetition laser, the experiment records relative delays reaching 430 plus or minus 20 as in this low-cross-section region. Results match advanced theory only partially, indicating that current calculations need refinement for strong correlation effects. This demonstrates that electron correlations can dominate timing in photoionization where single-particle pictures fail.

Core claim

The 3s photoionization channel of argon exhibits a Cooper-like minimum around 42 eV that arises exclusively from inter-electronic correlations with the 3p shell; experimental measurement with a 100 kHz laser system yields relative photoionization delays up to 430 plus or minus 20 as in this region, in partial agreement with state-of-the-art theory.

What carries the argument

The Cooper-like minimum in the 3s photoionization cross section, produced solely by correlations with the 3p shell, which amplifies the observed attosecond delays.

If this is right

Photoionization delays in atoms can be governed by electron correlations rather than independent-particle motion.
High-repetition-rate sources enable access to low-cross-section channels for attosecond timing measurements.
Theoretical models of photoionization must incorporate inter-channel correlations to predict delays near such minima.
Attosecond delay measurements can serve as a direct experimental signature of many-body electron effects.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

Analogous correlation minima may appear in other noble gases and could be mapped with similar techniques.
Large correlation-driven delays imply that photoionization timing offers a sensitive test of many-electron dynamics.
Extending the measurements to neighboring energies or different atoms would test how general the effect is.

Load-bearing premise

The measured delays arise exclusively from the correlation-induced Cooper-like minimum in the 3s channel, and the experiment isolates this channel accurately even though its cross section is very low.

What would settle it

A measurement finding delays near 42 eV that match single-particle predictions or fall well below 400 as would show the large delays are not produced by the reported correlation effect.

Figures

Figures reproduced from arXiv: 1907.01219 by A. Bray, A. Kheifets, C. F. Perry, D. Hammerland, H. J. Woerner, I. Seres, K. Osvay, P. Jojart, P. Zhang, S. Kuehn, T. T. Luu, V. Zuba, Z. Varallyay.

**Figure 2.** Figure 2: Photoelectron interferogram from argon in the re [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗

**Figure 3.** Figure 3: a) Experimental data (black) compared to all pub [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗

**Figure 4.** Figure 4: 3p photoionization delays of argon calculated with [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗

read the original abstract

Attosecond photoionization delays have mostly been interpreted within the single-particle approximation of multi-electron systems. The strong electron correlation between the photoionization channels associated with the 3p and 3s orbitals of argon presents an interesting arena where this single-particle approximation breaks down. Around photon energies of 42~eV, the 3s photoionization channel of argon experiences a ``Cooper-like" minimum, which is exclusively the result of inter-electronic correlations with the 3p shell. Photoionization delays around this ``Cooper-like" minimum have been predicted theoretically, but experimental verification has remained a challenge since the associated photoionization cross section is inherently very low. Here, we report the measurement of photoionization delays around the Cooper-like minimum that were acquired with the 100~kHz High-Repetition 1 laser system at the ELI-ALPS facility. We report relative photoionization delays reaching up to unprecedented values of 430 +/- 20~as, as a result of electron correlation. Our experimental results are in partial agreement with state-of-the-art theoretical results, but also demonstrate the need for additional theoretical developments.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

First experimental data on correlation-driven delays around argon's Cooper-like minimum, but low cross section leaves the 430 as claim open to possible contamination.

read the letter

The paper's main contribution is the first reported measurement of photoionization delays near the 3s Cooper-like minimum in argon at ~42 eV. They extract relative delays as large as 430 +/- 20 as using a 100 kHz laser at ELI-ALPS and attribute the size to electron correlation between 3s and 3p channels. This is new because earlier work had only theory predictions; the low cross section had blocked experiment until now. The high-repetition-rate source is a practical step that lets them accumulate signal where others could not. Partial agreement with advanced calculations is also useful, as it flags where theory still needs work. The central soft spot is exactly the low cross section. At such weak signal levels, even small leakage from the much stronger 3p channel, incomplete background subtraction, or reference-arm artifacts in the interferometry could produce spurious phase shifts of that magnitude. The abstract gives no quantitative check that the recorded electrons are dominated by the 3s channel at the minimum, and the partial theory match could reflect either an experimental offset or missing physics. Without the full methods and raw traces it is impossible to judge how cleanly they isolated the channel. This work is aimed at attosecond spectroscopists who already follow many-body effects in noble gases. A reader who needs a benchmark number for correlation-induced delays will find it here, but anyone building models will want the systematics clarified first. The paper is coherent on its own terms and supplies independent data rather than a fit, so it deserves peer review even if the referees will press hard on the isolation of the 3s signal.

Referee Report

1 major / 1 minor

Summary. The manuscript reports experimental measurements of attosecond photoionization delays in argon near the correlation-induced Cooper-like minimum (~42 eV) in the 3s channel. Using a 100 kHz high-repetition-rate laser at ELI-ALPS, relative delays reaching 430 ± 20 as are extracted and compared to state-of-the-art theory, with partial agreement noted; the work emphasizes the breakdown of the single-particle picture due to 3s-3p interchannel coupling.

Significance. If the channel isolation and background subtraction are robust, the result supplies a valuable experimental benchmark for many-electron effects on photoionization delays in a low-cross-section regime that has been theoretically predicted but experimentally elusive. The high-repetition-rate approach addresses the signal challenge and could stimulate further theory development.

major comments (1)

[Results / Methods] The central attribution of the 430 ± 20 as delays exclusively to the 3s Cooper-like minimum (abstract) rests on the assumption that the recorded signal is free of contamination from the dominant 3p channel or background. Given the explicitly low cross section at the minimum, the manuscript must provide quantitative evidence (e.g., channel-resolved yields, subtraction residuals, or SNR metrics) that residual 3p contributions cannot produce spurious phase shifts of this magnitude; without it the experimental isolation remains insecure.

minor comments (1)

[Abstract] The abstract states 'partial agreement' with theory; a brief enumeration of which delay features agree or disagree (energy dependence, magnitude at specific points) would improve clarity.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for highlighting the need to strengthen the evidence for channel isolation. We address the single major comment below.

read point-by-point responses

Referee: [Results / Methods] The central attribution of the 430 ± 20 as delays exclusively to the 3s Cooper-like minimum (abstract) rests on the assumption that the recorded signal is free of contamination from the dominant 3p channel or background. Given the explicitly low cross section at the minimum, the manuscript must provide quantitative evidence (e.g., channel-resolved yields, subtraction residuals, or SNR metrics) that residual 3p contributions cannot produce spurious phase shifts of this magnitude; without it the experimental isolation remains insecure.

Authors: We agree that explicit quantitative metrics are required to confirm that the measured delays can be attributed to the 3s channel without significant 3p contamination. The original manuscript describes the use of the 100 kHz high-repetition-rate source to overcome the low cross-section and outlines the background-subtraction procedure, but does not include the requested numerical benchmarks. In the revised manuscript we will add these data (channel-resolved yields, subtraction residuals, and SNR values) in the Methods or a supplementary section to show that any residual 3p contribution lies well below the level that could generate phase shifts of the observed size. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental measurement stands independent of any derivation chain

full rationale

The paper's central result is a direct experimental measurement of relative photoionization delays (up to 430 ± 20 as) obtained with a 100 kHz laser system at ELI-ALPS. No derivation, ansatz, or first-principles calculation is presented whose output reduces to its inputs by construction. Theoretical comparisons are external (state-of-the-art calculations) and only partially agree; the paper does not invoke self-citations to justify uniqueness or smuggle in fitted parameters renamed as predictions. The acknowledged low cross-section at the Cooper-like minimum is an experimental limitation, not a circularity issue. The result is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review provides no identifiable free parameters, axioms, or invented entities; theory comparison is mentioned without equations or fitting details.

pith-pipeline@v0.9.0 · 5797 in / 937 out tokens · 34161 ms · 2026-05-25T11:03:50.646976+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

IndisputableMonolith/Cost/FunctionalEquation.lean washburn_uniqueness_aczel unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

Around photon energies of 42 eV, the 3s photoionization channel of argon experiences a 'Cooper-like' minimum, which is exclusively the result of inter-electronic correlations with the 3p shell.
IndisputableMonolith/Foundation/AlexanderDuality.lean alexander_duality_circle_linking unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

Comparison with state-of-the-art calculations has revealed that electron correlation is the main source of these remarkably large delays.

What do these tags mean?

matches: The paper's claim is directly supported by a theorem in the formal canon.
supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses: The paper appears to rely on the theorem as machinery.
contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Reference graph

Works this paper leans on

31 extracted references · 31 canonical work pages

[1]

John W. Cooper. Photoionization from outer atomic sub- shells. a model study. Physical Review, 128(2):681–693,

work page
[2]

doi:10.1103/PhysRev.128.681

ISSN 0031899X. doi:10.1103/PhysRev.128.681

work page doi:10.1103/physrev.128.681
[3]

Ya Amusia, V

M. Ya Amusia, V. K. Ivanov, N. A. Cherepkov, and L. V. Chernysheva. Interference eﬀects in photoionization of noble gas atoms outer s-subshells. Physics Letters A , 40 (5):361–362, 1972. ISSN 03759601. doi:10.1016/0375- 9601(72)90531-2

work page doi:10.1016/0375- 1972
[4]

Kienberger, U Kleineberg, E Gouliel- makis, F Krausz, and V S Yakovlev

M Schultze, N Karpowicz, J Gagnon, M Korbman, M Hofstetter, S Neppl, A L Cavalieri, Y Komninos, C A Nicolaides, R Pazourek, S Nagele, J Feist, A M Azzeer, R Ernstorfer, R. Kienberger, U Kleineberg, E Gouliel- makis, F Krausz, and V S Yakovlev. Delay in Photoe- mission. Science, 328(June):1658–1662, 2010

work page 2010
[5]

Kl¨ under, J

K. Kl¨ under, J. M. Dahlstr¨ om, M. Gisselbrecht, T. Fordell, M. Swoboda, D. Gu´ enot, P. Johnsson, J. Caillat, J. Mauritsson, A. Maquet, R. Ta¨ ıeb, and A. L’Huillier. Probing single-photon ioniza- tion on the attosecond time scale. Physical Review Letters, 106(14):1–4, 2011. ISSN 00319007. doi: 10.1103/PhysRevLett.106.143002

work page doi:10.1103/physrevlett.106.143002 2011
[6]

Thermal conductivity of superconducting MgB 2

Renate Pazourek, Stefan Nagele, and Joachim Burgd¨ orfer. Probing time-ordering in two-photon double ionization of helium on the attosecond time scale. Journal of Physics B: Atomic, Molecular and Optical Physics, 48(6), 2015. ISSN 13616455. doi:10.1088/0953- 4075/48/6/061002

work page doi:10.1088/0953- 2015
[7]

A. S. Kheifets. Time delay in valence-shell photoioniza- tion of noble-gas atoms. Physical Review A - Atomic, Molecular, and Optical Physics , 87(6):1–9, 2013. ISSN 10502947. doi:10.1103/PhysRevA.87.063404

work page doi:10.1103/physreva.87.063404 2013
[8]

Gu´ enot, D

D. Gu´ enot, D. Kroon, E. Balogh, E. W. Larsen, M. Ko- tur, M. Miranda, T. Fordell, P. Johnsson, J. Mauritsson, M. Gisselbrecht, K. Varj´ u, C. L. Arnold, T. Carette, A. S. Kheifets, E. Lindroth, A. Lhuillier, and J. M. Dahlstr¨ om. 5 Measurements of relative photoemission time delays in noble gas atoms. Journal of Physics B: Atomic, Molec- ular and Optic...

work page doi:10.1088/0953-4075/47/24/245602 2014
[9]

Caryn Palatchi, J. M. Dahlstr¨ om, A. S. Kheifets, I. A. Ivanov, D. M. Canaday, P. Agostini, and L. F. Di- mauro. Atomic delay in helium, neon, argon and kryp- ton. Journal of Physics B: Atomic, Molecular and Optical Physics , 47(24):245003, 2014. ISSN 13616455. doi:10.1088/0953-4075/47/24/245003. URL http://dx. doi.org/10.1088/0953-4075/47/24/245003

work page doi:10.1088/0953-4075/47/24/245003 2014
[10]

Jordan, M

I. Jordan, M. Huppert, S. Pabst, A. S. Kheifets, D. Baykusheva, and H. J. W¨ orner. Spin-orbit delays in photoemission. Physical Review A, 95(1):1–7, 2017. ISSN 24699934. doi:10.1103/PhysRevA.95.013404

work page doi:10.1103/physreva.95.013404 2017
[12]

Theory of Attosecond Delays in Molecular Photoionization.Journal of Chemical Physics , 146(9), 2017

Denitsa Baykusheva and Hans Jakob W¨ orner. Theory of Attosecond Delays in Molecular Photoionization.Journal of Chemical Physics , 146(9), 2017. ISSN 10797114. doi: 10.1103/PhysRevLett.117.093001

work page doi:10.1103/physrevlett.117.093001 2017
[13]

J. Vos, L. Cattaneo, S. Patchkovskii, T. Zimmermann, C. Cirelli, M. Lucchini, A. S. Kheifets, A. S. Landsman, and U. Keller. Orientation-dependent stereo Wigner time delay and electron localization in a small molecule. Sci- ence, 360(6395):1326–1330, 2018. ISSN 10959203. doi: 10.1126/science.aao4731

work page doi:10.1126/science.aao4731 2018
[14]

Cattaneo, J

L. Cattaneo, J. Vos, R. Y. Bello, A. Palacios, S. Heuser, L. Pedrelli, M. Lucchini, C. Cirelli, F. Mart´ ın, and U. Keller. Attosecond coupled electron and nuclear dynamics in dissociative ionization of H 2. Nature Physics, 14(7):733–739, 2018. ISSN 17452481. doi: 10.1038/s41567-018-0103-2. URL http://dx.doi.org/ 10.1038/s41567-018-0103-2

work page doi:10.1038/s41567-018-0103-2 2018
[15]

Sali` eres V

P. Sali` eres V. Gruson, L. Barreau, ´A. Jim´ enez-Gal´ an, F. Risoud, J. Caillat, A. Maquet, B. Carr´ e, F. Lepetit, J-F. Hergott, T. Ruchon, L. Argenti, R. Ta¨ ıeb, F. Mart´ ın. At- tosecond dynamics through a Fano resonance: Monitor- ing the birth of a photoelectron. Science, 354(Basalt 1): 16, 2014. ISSN 10959203. doi:10.1126/science.1252826

work page doi:10.1126/science.1252826 2014
[16]

Claudio Cirelli, Carlos Marante, Sebastian Heuser, C. L.M. Petersson, ´Alvaro Jim´ enez Gal´ an, Luca Argenti, Shiyang Zhong, David Busto, Marcus Isinger, Saikat Nandi, Sylvain MacLot, Linnea Rading, Per Johnsson, Mathieu Gisselbrecht, Matteo Lucchini, Lukas Gallmann, J. Marcus Dahlstr¨ om, Eva Lindroth, Anne L’Huillier, Fernando Mart´ ın, and Ursula Kell...

work page doi:10.1038/s41467-018-03009-1 2018
[17]

Deshmukh, Valeriy K

Sourav Banerjee, Pranawa C. Deshmukh, Valeriy K. Dol- matov, Steven T. Manson, and A. S. Kheifets. Strong dependence of photoionization time delay on energy and angle in the neighborhood of Fano resonances. Physi- cal Review A , 99(1):13416, 2019. ISSN 24699934. doi: 10.1103/PhysRevA.99.013416. URL https://doi.org/ 10.1103/PhysRevA.99.013416

work page doi:10.1103/physreva.99.013416 2019
[18]

Ossiander, F

M. Ossiander, F. Siegrist, V. Shirvanyan, R. Pazourek, A. Sommer, T. Latka, A. Guggenmos, S. Nagele, J. Feist, J. Burgd¨ orfer, R. Kienberger, and M. Schultze. Attosec- ond correlation dynamics. Nature Physics , 13(3):280– 285, 2017. ISSN 17452481. doi:10.1038/nphys3941

work page doi:10.1038/nphys3941 2017
[19]

Isinger, R

M. Isinger, R. J. Squibb, D. Busto, S. Zhong, A. Harth, D. Kroon, S. Nandi, C. L. Arnold, M. Miranda, J. M. Dahlstr¨ om, E. Lindroth, R. Feifel, M. Gisselbrecht, and A. L’Huillier. Photoionization in the time and fre- quency domain. Science, 358(6365):893–896, 2017. ISSN 10959203. doi:10.1126/science.aao7043

work page doi:10.1126/science.aao7043 2017
[20]

Gu´ enot, K

D. Gu´ enot, K. Kl¨ under, C. L. Arnold, D. Kroon, J. M. Dahlstr¨ om, M. Miranda, T. Fordell, M. Gis- selbrecht, P. Johnsson, J. Mauritsson, E. Lindroth, A. Maquet, R. Ta¨ ıeb, A. L’Huillier, and A. S. Kheifets. Photoemission-time-delay measurements and calcula- tions close to the 3s-ionization-cross-section minimum in Ar. Physical Review A - Atomic, Mole...

work page doi:10.1103/physreva.85.053424 2012
[21]

J. M. Dahlstr¨ om, T. Carette, and E. Lindroth. Dia- grammatic approach to attosecond delays in photoion- ization. Physical Review A - Atomic, Molecular, and Optical Physics , 86(6):1–4, 2012. ISSN 10502947. doi: 10.1103/PhysRevA.86.061402

work page doi:10.1103/physreva.86.061402 2012
[22]

Varma, P

Soumyajit Saha, Ankur Mandal, Jobin Jose, Hari R. Varma, P. C. Deshmukh, A. S. Kheifets, V. K. Dolma- tov, and S. T. Manson. Relativistic eﬀects in photoion- ization time delay near the Cooper minimum of noble- gas atoms. Physical Review A - Atomic, Molecular, and Optical Physics , 90(5):1–7, 2014. ISSN 10941622. doi: 10.1103/PhysRevA.90.053406

work page doi:10.1103/physreva.90.053406 2014
[23]

Observation of a Train of Attosecond Pulses from High Harmonic Generation

Paul, P M., Toma, E S., Breger, P., Mullot, G., Auge, F., Balcou, Muller, H G., and Agostini. Observation of a Train of Attosecond Pulses from High Harmonic Generation. Science, 292(5522):1689–1692, 2001. doi: 10.1126/science.1059413

work page doi:10.1126/science.1059413 2001
[24]

H. G. Muller. Reconstruction of attosecond harmonic beating by interference of two-photon transitions. Ap- plied Physics B: Lasers and Optics , 74(SUPPL.):17–21,

work page
[25]

doi:10.1007/s00340-002-0894-8

ISSN 09462171. doi:10.1007/s00340-002-0894-8

work page doi:10.1007/s00340-002-0894-8
[26]

The ELI-ALPS facility : the next generation of attosecond sources

Sergei K¨ uhn, Mathieu Dumergue, Subhendu Kahaly, Sudipta Mondal, Francesca Calegari, Giuseppe San- sone, Salvatore Stagira, Steﬀen H¨ adrich, Jan Rothhardt, Manuel Krebs, Derryck T Reid, Christoph M Heyl, and Robert R Thomson. The ELI-ALPS facility : the next generation of attosecond sources. Journal of Physics B: Atomic, Molecular and Optical Physics , 50, 2017

work page 2017
[27]

Hammerland, P

D. Hammerland, P. Zhang, S. Kuehn, P. Jojart, I. Seres, V. Zuba, Z. Varallyay, K. Osvay, T. T. Luu, and H. J. Woerner. Reconstruction of attosecond pulses in the pres- ence of interfering dressing ﬁelds using the 100 kHz ELI- ALPS HR-1 laser system. Arxiv, pages 1–7, 2019. URL http://arxiv.org/abs/1906.07059

work page arXiv 2019
[28]

Bray, Faiza Naseem, and A

Alexander W. Bray, Faiza Naseem, and A. S. Kheifets. Simulation of angular-resolved RABBITT measurements in noble-gas atoms. Physical Review A, 97(6):1–12, 2018. ISSN 24699934. doi:10.1103/PhysRevA.97.063404

work page doi:10.1103/physreva.97.063404 2018
[29]

Photoelectron spectrometer for liquid and gas-phase attosecond spectroscopy with ﬁeld-free and magnetic bottle operation modes

Inga Jordan, Arohi Jain, Thomas Gaumnitz, Jun Ma, and Hans Jakob W¨ orner. Photoelectron spectrometer for liquid and gas-phase attosecond spectroscopy with ﬁeld-free and magnetic bottle operation modes. Review of Scientiﬁc Instruments , 89(5), 2018. ISSN 10897623. doi:10.1063/1.5011657

work page doi:10.1063/1.5011657 2018
[30]

Bertrand, P

Hans Jakob W¨ orner, Hiromichi Niikura, Julien B. Bertrand, P. B. Corkum, and D. M. Villeneuve. Obser- vation of electronic structure minima in high-harmonic generation. Physical Review Letters , 102(10):1–4, 2009. ISSN 00319007. doi:10.1103/PhysRevLett.102.103901. 6

work page doi:10.1103/physrevlett.102.103901 2009
[31]

iSURF : a family of in ﬁ nite-time surface ﬂ ux methods

F Morales, T BRedtmann, and S Patckovskii. iSURF : a family of in ﬁ nite-time surface ﬂ ux methods. Journal of Physics B: Atomic, Molecular and Optical Physics , 49,

work page
[32]

doi:doi:10.1088/0953-4075/49/24/245001

work page doi:10.1088/0953-4075/49/24/245001

[1] [1]

John W. Cooper. Photoionization from outer atomic sub- shells. a model study. Physical Review, 128(2):681–693,

work page

[2] [2]

doi:10.1103/PhysRev.128.681

ISSN 0031899X. doi:10.1103/PhysRev.128.681

work page doi:10.1103/physrev.128.681

[3] [3]

Ya Amusia, V

M. Ya Amusia, V. K. Ivanov, N. A. Cherepkov, and L. V. Chernysheva. Interference eﬀects in photoionization of noble gas atoms outer s-subshells. Physics Letters A , 40 (5):361–362, 1972. ISSN 03759601. doi:10.1016/0375- 9601(72)90531-2

work page doi:10.1016/0375- 1972

[4] [4]

Kienberger, U Kleineberg, E Gouliel- makis, F Krausz, and V S Yakovlev

M Schultze, N Karpowicz, J Gagnon, M Korbman, M Hofstetter, S Neppl, A L Cavalieri, Y Komninos, C A Nicolaides, R Pazourek, S Nagele, J Feist, A M Azzeer, R Ernstorfer, R. Kienberger, U Kleineberg, E Gouliel- makis, F Krausz, and V S Yakovlev. Delay in Photoe- mission. Science, 328(June):1658–1662, 2010

work page 2010

[5] [5]

Kl¨ under, J

K. Kl¨ under, J. M. Dahlstr¨ om, M. Gisselbrecht, T. Fordell, M. Swoboda, D. Gu´ enot, P. Johnsson, J. Caillat, J. Mauritsson, A. Maquet, R. Ta¨ ıeb, and A. L’Huillier. Probing single-photon ioniza- tion on the attosecond time scale. Physical Review Letters, 106(14):1–4, 2011. ISSN 00319007. doi: 10.1103/PhysRevLett.106.143002

work page doi:10.1103/physrevlett.106.143002 2011

[6] [6]

Thermal conductivity of superconducting MgB 2

Renate Pazourek, Stefan Nagele, and Joachim Burgd¨ orfer. Probing time-ordering in two-photon double ionization of helium on the attosecond time scale. Journal of Physics B: Atomic, Molecular and Optical Physics, 48(6), 2015. ISSN 13616455. doi:10.1088/0953- 4075/48/6/061002

work page doi:10.1088/0953- 2015

[7] [7]

A. S. Kheifets. Time delay in valence-shell photoioniza- tion of noble-gas atoms. Physical Review A - Atomic, Molecular, and Optical Physics , 87(6):1–9, 2013. ISSN 10502947. doi:10.1103/PhysRevA.87.063404

work page doi:10.1103/physreva.87.063404 2013

[8] [8]

Gu´ enot, D

D. Gu´ enot, D. Kroon, E. Balogh, E. W. Larsen, M. Ko- tur, M. Miranda, T. Fordell, P. Johnsson, J. Mauritsson, M. Gisselbrecht, K. Varj´ u, C. L. Arnold, T. Carette, A. S. Kheifets, E. Lindroth, A. Lhuillier, and J. M. Dahlstr¨ om. 5 Measurements of relative photoemission time delays in noble gas atoms. Journal of Physics B: Atomic, Molec- ular and Optic...

work page doi:10.1088/0953-4075/47/24/245602 2014

[9] [9]

Caryn Palatchi, J. M. Dahlstr¨ om, A. S. Kheifets, I. A. Ivanov, D. M. Canaday, P. Agostini, and L. F. Di- mauro. Atomic delay in helium, neon, argon and kryp- ton. Journal of Physics B: Atomic, Molecular and Optical Physics , 47(24):245003, 2014. ISSN 13616455. doi:10.1088/0953-4075/47/24/245003. URL http://dx. doi.org/10.1088/0953-4075/47/24/245003

work page doi:10.1088/0953-4075/47/24/245003 2014

[10] [10]

Jordan, M

I. Jordan, M. Huppert, S. Pabst, A. S. Kheifets, D. Baykusheva, and H. J. W¨ orner. Spin-orbit delays in photoemission. Physical Review A, 95(1):1–7, 2017. ISSN 24699934. doi:10.1103/PhysRevA.95.013404

work page doi:10.1103/physreva.95.013404 2017

[11] [12]

Theory of Attosecond Delays in Molecular Photoionization.Journal of Chemical Physics , 146(9), 2017

Denitsa Baykusheva and Hans Jakob W¨ orner. Theory of Attosecond Delays in Molecular Photoionization.Journal of Chemical Physics , 146(9), 2017. ISSN 10797114. doi: 10.1103/PhysRevLett.117.093001

work page doi:10.1103/physrevlett.117.093001 2017

[12] [13]

J. Vos, L. Cattaneo, S. Patchkovskii, T. Zimmermann, C. Cirelli, M. Lucchini, A. S. Kheifets, A. S. Landsman, and U. Keller. Orientation-dependent stereo Wigner time delay and electron localization in a small molecule. Sci- ence, 360(6395):1326–1330, 2018. ISSN 10959203. doi: 10.1126/science.aao4731

work page doi:10.1126/science.aao4731 2018

[13] [14]

Cattaneo, J

L. Cattaneo, J. Vos, R. Y. Bello, A. Palacios, S. Heuser, L. Pedrelli, M. Lucchini, C. Cirelli, F. Mart´ ın, and U. Keller. Attosecond coupled electron and nuclear dynamics in dissociative ionization of H 2. Nature Physics, 14(7):733–739, 2018. ISSN 17452481. doi: 10.1038/s41567-018-0103-2. URL http://dx.doi.org/ 10.1038/s41567-018-0103-2

work page doi:10.1038/s41567-018-0103-2 2018

[14] [15]

Sali` eres V

P. Sali` eres V. Gruson, L. Barreau, ´A. Jim´ enez-Gal´ an, F. Risoud, J. Caillat, A. Maquet, B. Carr´ e, F. Lepetit, J-F. Hergott, T. Ruchon, L. Argenti, R. Ta¨ ıeb, F. Mart´ ın. At- tosecond dynamics through a Fano resonance: Monitor- ing the birth of a photoelectron. Science, 354(Basalt 1): 16, 2014. ISSN 10959203. doi:10.1126/science.1252826

work page doi:10.1126/science.1252826 2014

[15] [16]

Claudio Cirelli, Carlos Marante, Sebastian Heuser, C. L.M. Petersson, ´Alvaro Jim´ enez Gal´ an, Luca Argenti, Shiyang Zhong, David Busto, Marcus Isinger, Saikat Nandi, Sylvain MacLot, Linnea Rading, Per Johnsson, Mathieu Gisselbrecht, Matteo Lucchini, Lukas Gallmann, J. Marcus Dahlstr¨ om, Eva Lindroth, Anne L’Huillier, Fernando Mart´ ın, and Ursula Kell...

work page doi:10.1038/s41467-018-03009-1 2018

[16] [17]

Deshmukh, Valeriy K

Sourav Banerjee, Pranawa C. Deshmukh, Valeriy K. Dol- matov, Steven T. Manson, and A. S. Kheifets. Strong dependence of photoionization time delay on energy and angle in the neighborhood of Fano resonances. Physi- cal Review A , 99(1):13416, 2019. ISSN 24699934. doi: 10.1103/PhysRevA.99.013416. URL https://doi.org/ 10.1103/PhysRevA.99.013416

work page doi:10.1103/physreva.99.013416 2019

[17] [18]

Ossiander, F

M. Ossiander, F. Siegrist, V. Shirvanyan, R. Pazourek, A. Sommer, T. Latka, A. Guggenmos, S. Nagele, J. Feist, J. Burgd¨ orfer, R. Kienberger, and M. Schultze. Attosec- ond correlation dynamics. Nature Physics , 13(3):280– 285, 2017. ISSN 17452481. doi:10.1038/nphys3941

work page doi:10.1038/nphys3941 2017

[18] [19]

Isinger, R

M. Isinger, R. J. Squibb, D. Busto, S. Zhong, A. Harth, D. Kroon, S. Nandi, C. L. Arnold, M. Miranda, J. M. Dahlstr¨ om, E. Lindroth, R. Feifel, M. Gisselbrecht, and A. L’Huillier. Photoionization in the time and fre- quency domain. Science, 358(6365):893–896, 2017. ISSN 10959203. doi:10.1126/science.aao7043

work page doi:10.1126/science.aao7043 2017

[19] [20]

Gu´ enot, K

D. Gu´ enot, K. Kl¨ under, C. L. Arnold, D. Kroon, J. M. Dahlstr¨ om, M. Miranda, T. Fordell, M. Gis- selbrecht, P. Johnsson, J. Mauritsson, E. Lindroth, A. Maquet, R. Ta¨ ıeb, A. L’Huillier, and A. S. Kheifets. Photoemission-time-delay measurements and calcula- tions close to the 3s-ionization-cross-section minimum in Ar. Physical Review A - Atomic, Mole...

work page doi:10.1103/physreva.85.053424 2012

[20] [21]

J. M. Dahlstr¨ om, T. Carette, and E. Lindroth. Dia- grammatic approach to attosecond delays in photoion- ization. Physical Review A - Atomic, Molecular, and Optical Physics , 86(6):1–4, 2012. ISSN 10502947. doi: 10.1103/PhysRevA.86.061402

work page doi:10.1103/physreva.86.061402 2012

[21] [22]

Varma, P

Soumyajit Saha, Ankur Mandal, Jobin Jose, Hari R. Varma, P. C. Deshmukh, A. S. Kheifets, V. K. Dolma- tov, and S. T. Manson. Relativistic eﬀects in photoion- ization time delay near the Cooper minimum of noble- gas atoms. Physical Review A - Atomic, Molecular, and Optical Physics , 90(5):1–7, 2014. ISSN 10941622. doi: 10.1103/PhysRevA.90.053406

work page doi:10.1103/physreva.90.053406 2014

[22] [23]

Observation of a Train of Attosecond Pulses from High Harmonic Generation

Paul, P M., Toma, E S., Breger, P., Mullot, G., Auge, F., Balcou, Muller, H G., and Agostini. Observation of a Train of Attosecond Pulses from High Harmonic Generation. Science, 292(5522):1689–1692, 2001. doi: 10.1126/science.1059413

work page doi:10.1126/science.1059413 2001

[23] [24]

H. G. Muller. Reconstruction of attosecond harmonic beating by interference of two-photon transitions. Ap- plied Physics B: Lasers and Optics , 74(SUPPL.):17–21,

work page

[24] [25]

doi:10.1007/s00340-002-0894-8

ISSN 09462171. doi:10.1007/s00340-002-0894-8

work page doi:10.1007/s00340-002-0894-8

[25] [26]

The ELI-ALPS facility : the next generation of attosecond sources

Sergei K¨ uhn, Mathieu Dumergue, Subhendu Kahaly, Sudipta Mondal, Francesca Calegari, Giuseppe San- sone, Salvatore Stagira, Steﬀen H¨ adrich, Jan Rothhardt, Manuel Krebs, Derryck T Reid, Christoph M Heyl, and Robert R Thomson. The ELI-ALPS facility : the next generation of attosecond sources. Journal of Physics B: Atomic, Molecular and Optical Physics , 50, 2017

work page 2017

[26] [27]

Hammerland, P

D. Hammerland, P. Zhang, S. Kuehn, P. Jojart, I. Seres, V. Zuba, Z. Varallyay, K. Osvay, T. T. Luu, and H. J. Woerner. Reconstruction of attosecond pulses in the pres- ence of interfering dressing ﬁelds using the 100 kHz ELI- ALPS HR-1 laser system. Arxiv, pages 1–7, 2019. URL http://arxiv.org/abs/1906.07059

work page arXiv 2019

[27] [28]

Bray, Faiza Naseem, and A

Alexander W. Bray, Faiza Naseem, and A. S. Kheifets. Simulation of angular-resolved RABBITT measurements in noble-gas atoms. Physical Review A, 97(6):1–12, 2018. ISSN 24699934. doi:10.1103/PhysRevA.97.063404

work page doi:10.1103/physreva.97.063404 2018

[28] [29]

Photoelectron spectrometer for liquid and gas-phase attosecond spectroscopy with ﬁeld-free and magnetic bottle operation modes

Inga Jordan, Arohi Jain, Thomas Gaumnitz, Jun Ma, and Hans Jakob W¨ orner. Photoelectron spectrometer for liquid and gas-phase attosecond spectroscopy with ﬁeld-free and magnetic bottle operation modes. Review of Scientiﬁc Instruments , 89(5), 2018. ISSN 10897623. doi:10.1063/1.5011657

work page doi:10.1063/1.5011657 2018

[29] [30]

Bertrand, P

Hans Jakob W¨ orner, Hiromichi Niikura, Julien B. Bertrand, P. B. Corkum, and D. M. Villeneuve. Obser- vation of electronic structure minima in high-harmonic generation. Physical Review Letters , 102(10):1–4, 2009. ISSN 00319007. doi:10.1103/PhysRevLett.102.103901. 6

work page doi:10.1103/physrevlett.102.103901 2009

[30] [31]

iSURF : a family of in ﬁ nite-time surface ﬂ ux methods

F Morales, T BRedtmann, and S Patckovskii. iSURF : a family of in ﬁ nite-time surface ﬂ ux methods. Journal of Physics B: Atomic, Molecular and Optical Physics , 49,

work page

[31] [32]

doi:doi:10.1088/0953-4075/49/24/245001

work page doi:10.1088/0953-4075/49/24/245001