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Momentum imaging of electrons and recoil ions from anion–neutral interactions in a cryogenic ion storage ring

F. Herrmann1, W. Zhang1, M. Schulz1,2, D. V. Chicharro1, A. Dorn1, M. Grieser1, F. Grussie1, H. Kreckel1, O. Novotny1 et al.

F. Trost1, A. Wolf1, T. Pfeifer1, C. D. Schröter1, and R. Moshammer1

  • 1Max-Planck-Institute for Nuclear Physics, Saupfercheckweg 1, D-69117 Heidelberg, Germany
  • 2Missouri University of Science & Technology, Physics Department and Laboratory for Atomic, Molecular, and Optical Research, Rolla, Missouri 65409, USA

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Phys. Rev. Research 7, L012082 – Published 25 March, 2025

DOI: https://doi.org/10.1103/PhysRevResearch.7.L012082

Abstract

We have momentum-analyzed electrons and recoil ions in triple coincidence with projectiles neutralized in 300-keV Si−+Ar collisions. The experiment was performed at a cryogenic ion storage ring with an in-ring reaction microscope. Differential momentum distributions for detachment with simultaneous target ionization were obtained. At more than 15% of the detachment-only rate the ionization rate is surprisingly large. A correlated two-electron channel is found to be dominant. This is also unexpected because the projectile energy is well below the threshold for the correlated process.

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Phys. Rev. Research 7, L012082– Published 25 March, 2025
  • Received 13 December 2024
  • Revised 29 January 2025
  • Accepted 11 March 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by Max Planck Society.

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