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The Auger spectra in argon induced by electron impact – new measurements with high resolution

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Abstract

The Auger spectrum of argon in the kinetic energy region (135–235 eV) has been measured using a non-monochromatic electron beam (incident energy from 313 to 2019 eV) at two ejection angles of 60° and 90° with a high resolution electrostatic analyzer. The electron impact energies of 313 and 323 eV have been used in order to disentangle the contribution of the ionization and decay of the 2s state. The systematic analysis of the measured spectra shows the dominance of the Coster-Kronig transitions from the 2s ionization in the energy region 135–159 eV and 208–235 eV, while the Auger transitions from the 2p ionization are dominant in the energy region 160–208 eV. The high resolution of the present work led to the observation of a certain number of new features in two energy regions 135–159 and 208–235 eV, respectively. Recent literature data on the cascade Auger processes and threshold formation of Ar2+ satellite states allow the assignment of some of them, while other have been left without assignments. The influence of the PCI effect on the line-shape, width and energy position of the features in the kinetic energy region 200–208 eV has been also investigated and the PCI shift versus excess energy above threshold compared with previous data and theoretical predictions.

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Authors and Affiliations

  1. Institute of Physics Belgrade, University of Belgrade, Laboratory for Atomic Collision Processes, Pregrevica 118, 11080, Belgrade, Serbia

    Jozo J. Jureta & Bratislav P. Marinković

  2. CNR-Istituto di Struttura della Materia, Area della Ricerca di Roma 1, CP10, 00015, Monterotondo, Scalo, Italy

    Lorenzo Avaldi

Authors
  1. Jozo J. Jureta
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  2. Bratislav P. Marinković
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  3. Lorenzo Avaldi
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Contributions

Experimental data and drafting manuscript: J.J.J.; discussion and analysis of data, corrections and final version of the manuscript: J.J.J., B.P.M. and L.A.

Corresponding author

Correspondence to Bratislav P. Marinković.

Additional information

Contribution to the Topical Issue “Low-Energy Positron and Positronium Physics and Electron-Molecule Collisions and Swarms (POSMOL 2019)”, edited by Michael Brunger, David Cassidy, Saša Dujko, Dragana Maric, Joan Marler, James Sullivan, Juraj Fedor.

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Jureta, J.J., Marinković, B.P. & Avaldi, L. The Auger spectra in argon induced by electron impact – new measurements with high resolution. Eur. Phys. J. D 74, 12 (2020). https://doi.org/10.1140/epjd/e2019-100541-5

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  • DOI: https://doi.org/10.1140/epjd/e2019-100541-5

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