Helium anion formation inside helium droplets

  • Elias Jabbour Al Maalouf
  • Julia Reitshammer
  • Anita Ribar
  • Paul Scheier
  • Stephan Denifl
Open Access
Regular Article
Part of the following topical collections:
  1. Topical Issue: Advances in Positron and Electron Scattering

Abstract

The formation of He∗− is examined with improved electron energy resolution of about 100 meV utilizing a hemispherical electron monochromator. The work presented provides a precise determination of the three previously determined resonance peak positions that significantly contribute to the formation of He∗− inside helium nanodroplets in the energy range from 20 eV to 29.5 eV. In addition, a new feature is identified located at 27.69 ± 0.18 eV that we assign to the presence of O2 as a dopant inside the droplet. With increasing droplet size a small blue shift of the resonance positions is observed. Also for the relatively low electron currents used in the present study (i.e., 15–70 nA) a quadratic dependence of the He∗− ion yield on the electron current is observed.

Graphical abstract

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Copyright information

© The Author(s) 2016

Open Access This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Authors and Affiliations

  • Elias Jabbour Al Maalouf
    • 1
  • Julia Reitshammer
    • 1
  • Anita Ribar
    • 1
  • Paul Scheier
    • 1
  • Stephan Denifl
    • 1
  1. 1.Institut für Ionenphysik und Angewandte Physik, Universität InnsbruckInnsbruckAustria

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