Electron Emission from Insulators Irradiated by Slow Highly Charged Ions

Walter Meissl; Daniel Winklehner; Friedrich Aumayr; Martin C. Simon; Rainer Ginzel; José R. Crespo López-Urrutia; Joachim Ullrich; Beate Solleder; Christoph Lemell; Joachim Burgdörfer

doi:10.1380/ejssnt.2008.54

Conference -ALC07-

Electron Emission from Insulators Irradiated by Slow Highly Charged Ions

Walter Meissl, Daniel Winklehner, Friedrich Aumayr, Martin C. Simon, Rainer Ginzel, José R. Crespo López-Urrutia, Joachim Ullrich, Beate Solleder, Christoph Lemell, Joachim Burgdörfer

Author information

Walter Meissl
Institut fuer Allgemeine Physik, Vienna University of Technology, Austria, EU
Daniel Winklehner
Institut fuer Allgemeine Physik, Vienna University of Technology, Austria, EU
Friedrich Aumayr
Institut fuer Allgemeine Physik, Vienna University of Technology, Austria, EU
Martin C. Simon
EBIT group, Max-Planck-Institute for Nuclear Physics, Germany, EU
Rainer Ginzel
EBIT group, Max-Planck-Institute for Nuclear Physics, Germany, EU
José R. Crespo López-Urrutia
EBIT group, Max-Planck-Institute for Nuclear Physics, Germany, EU
Joachim Ullrich
EBIT group, Max-Planck-Institute for Nuclear Physics, Germany, EU
Beate Solleder
Institute for Theoretical Physics, Vienna University of Technology, Austria, EU
Christoph Lemell
Institute for Theoretical Physics, Vienna University of Technology, Austria, EU
Joachim Burgdörfer
Institute for Theoretical Physics, Vienna University of Technology, Austria, EU

Keywords: Electron emission measurements, Alkali halides, Single crystal surfaces, Auger ejection, Ion-solid interactions, Highly charged ions, Hollow atoms, Insulators

JOURNAL FREE ACCESS

2008 Volume 6 Pages 54-59

DOI https://doi.org/10.1380/ejssnt.2008.54

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Abstract

Total electron emission yields have been measured for the first time resulting from impact of slow highly charged Ar^q+ (q ≤ 17), Xe^q+ (q ≤ 50) and Hg^q+ (q ≤ 68) ions on clean insulating LiF(001) and CaF₂(111) surfaces at various impact angles. The surprisingly large yields show that even for the highest projectile charge states, a local charge-up of the surface poses no barrier for electron emission. We demonstrate that this is due to a strong sub-surface contribution in the potential electron emission process which is considerably more efficient in insulators because of the increased inelastic mean free path and the production of secondary electrons. [DOI: 10.1380/ejssnt.2008.54]

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