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Time delays from one-photon transitions in the continuum

Publicated to:Optica. 7 (2): 154-161 - 2020-02-20 7(2), DOI: 10.1364/OPTICA.378639

Authors: Fuchs, Jaco; Douguet, Nicolas; Donsa, Stefan; Martin, Fernando; Burgdoerfer, Joachim; Argenti, Luca; Cattaneo, Laura; Keller, Ursula

Affiliations

ETH Zürich - Author
IMDEA Nanociencia - Author
Inst Madrileno Estudios Avanzados Nanociencia IMD, Madrid 28049, Spain - Author
Swiss Fed Inst Technol, Dept Phys, Zurich, Switzerland - Author
Technische Universitat Wien - Author
UAM-IFIMAC-Condensed Matter Physics Center - Author
Univ Autonoma Madrid, Condensed Matter Phys Ctr IFIMAC, E-28049 Madrid, Spain - Author
Univ Autonoma Madrid, Dept Quim Modulo 13, E-28049 Madrid, Spain - Author
Univ Cent Florida, CREOL, Orlando, FL 32186 USA - Author
Univ Cent Florida, Dept Phys, Orlando, FL 32186 USA - Author
Universidad Autónoma de Madrid - Author
University of Central Florida - Author
Vienna Univ Technol, Inst Theoret Phys, Vienna, Austria - Author
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Abstract

© 2020 Optical Society of America 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.

Keywords
Affordable and clean energy

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Optica due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2020, it was in position 6/99, thus managing to position itself as a Q1 (Primer Cuartil), in the category Optics. Notably, the journal is positioned above the 90th percentile.

From a relative perspective, and based on the normalized impact indicator calculated from World Citations provided by WoS (ESI, Clarivate), it yields a value for the citation normalization relative to the expected citation rate of: 5.53. This indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: ESI Nov 14, 2024)

This information is reinforced by other indicators of the same type, which, although dynamic over time and dependent on the set of average global citations at the time of their calculation, consistently position the work at some point among the top 50% most cited in its field:

  • Weighted Average of Normalized Impact by the Scopus agency: 4.37 (source consulted: FECYT Feb 2024)
  • Field Citation Ratio (FCR) from Dimensions: 20.9 (source consulted: Dimensions May 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-05-10, the following number of citations:

  • WoS: 59
  • Scopus: 66
  • Google Scholar: 17
  • OpenCitations: 63
Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-05-10:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 74.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 74 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 75.74.
  • The number of mentions on the social network X (formerly Twitter): 5 (Altmetric).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
  • Assignment of a Handle/URN as an identifier within the deposit in the Institutional Repository: https://repositorio.uam.es/handle/10486/691105
Continuing with the social impact of the work, it is important to emphasize that, due to its content, it can be assigned to the area of interest of ODS 7 - Ensure access to affordable, reliable, sustainable and modern energy for all, with a probability of 92% according to the mBERT algorithm developed by Aurora University.
Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: Austria; Switzerland; United States of America.