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Grant support

This work was supported by the European COST Action AttoChem No. CA18222, the French National Research Agency in the frame of the Investments for the Future Programme IdEx Bordeaux, LAPHIA (Program No. ANR-10-IDEX-03-02), and the Spanish Ministry of Science and Innovation MICINN through Project No. PDI2019105458RB-I00, the Severo Ochoa Programme for Centres of Excellence in R&D (Program No. SEV-2016-0686) and the Maria de Maeztu Programme for Units of Excellence in R&D (Program No. CEX2018-000805-M). The authors thank the University of Bordeaux for providing access to the Mesocentre de Calcul Intensif Aquitain and theMareNostrum in the Barcelona Supercomputing Center through the Spanish Supercomputing Network and in the Centro Computacion Cientifica at UAM.

Analysis of institutional authors

Sopena, AAuthorPalacios, AAuthorMartin, FAuthor

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April 4, 2022
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Asymmetric electron angular distributions in H-2 induced by intense ultrashort soft-x-ray laser pulses

Publicated to:Physical review A: atomic, molecular and optical physics. 105 (3): 33104- - 2022-03-01 105(3), DOI: 10.1103/physreva.105.033104

Authors: Sopena, Arturo; Catoire, Fabrice; Palacios, Alicia; Martin, Fernando; Bachau, Henri;

Affiliations

Inst Madrileno Estudios Advanzados Nanociencia, Madrid 28049, Spain - Author
Univ Autonoma Madrid, Condensed Matter Phys Ctr, Madrid 28049, Spain - Author
Univ Autonoma Madrid, Dept Quim, Modulo 13, Madrid 28049, Spain - Author
Univ Autonoma Madrid, Inst Adv Res Chim Sci, Madrid 28049, Spain - Author
Univ Bordeaux, Ctr Lasers Intenses & Applicat, CNRS, CEA, F-33405 Talence, France - Author
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Abstract

X-ray free-electron-laser facilities generate nowadays ultrashort pulses with intensities as high as 1020 W/cm(2). The interaction of these light sources with atoms and molecules thus opens the way to still unexplored phenomena, where the commonly employed dipole approximation breaks down, and nonlinear excitation and ionization, e.g., Raman and Compton-like processes, come into play. We have developed theoretical tools to describe the interaction of intense attosecond soft-x-ray pulses with the hydrogen molecule in the photon energy ranging from 0.5 to 1.6 keV. We solve the time-dependent Schrodinger equation including both dipole and nondipole terms to obtain single-ionization photoelectron spectra differential in both energy and angle of the ejected electron. The signature of stimulated Compton scattering is clearly seen in the photoelectron spectra just above the ionization threshold, where nondipole effects manifest. Remarkably, the interference between dipole-and nondipole-induced quantum paths leads to a significant asymmetry of the photoelectron angular distributions. We show that this asymmetry strongly depends on the relative direction of the light polarization and propagation vectors with respect to the molecular orientation.

Keywords

B-splinesCompton-scatteringFieldHydrogenIonizationOperationPhotoionizationSpectroscopy

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Physical review A: atomic, molecular and optical physics due to its progression and the good impact it has achieved in recent years, according to the agency Scopus (SJR), it has become a reference in its field. In the year of publication of the work, 2022, it was in position , thus managing to position itself as a Q1 (Primer Cuartil), in the category Atomic and Molecular Physics, and Optics.

Independientemente del impacto esperado determinado por el canal de difusión, es importante destacar el impacto real observado de la propia aportación.

Según las diferentes agencias de indexación, el número de citas acumuladas por esta publicación hasta la fecha 2025-08-14:

  • WoS: 1
  • Scopus: 2

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 2025-08-14:

  • 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: 12.
  • 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: 14 (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: 1.
  • The number of mentions on the social network X (formerly Twitter): 2 (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/10486/702932

Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: France.

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (SOPENA MOROS, ARTURO) .