Czechoslovak Journal of Physics

, Volume 55, Issue 10, pp 1283–1291 | Cite as

The influence of ion bombardment on emission properties of small dust grains

  • P. Zilavy
  • I. Richterova
  • Z. Nemecek
  • J. Safrankova
  • J. Pavlu
Article
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Accepted:

Abstract

Dust grains that are present in many plasma and vacuum systems and in the space usually carry a non-negligible charge. Their charging significantly depends on surface properties of the grain material. In cold plasma, charging is mainly given by electron attachment, nevertheless, when plasma becomes hot, other processes (secondary electron emission, field emission, etc.) take place. Emission properties of the grain surface could be modified by grain baking or by ion bombardment.

Our study is carried out at the dust charging experiment dealing with a single dust grain electro-dynamically levitated in a 3D quadrupole trap. The grain can be exposed to the ion beam in the energy range of 100 eV–5 keV and to the electron beam in the energy range of 100 eV–10 keV. We have chosen He+ and Ar+ ions for the surface treatment and the observed influence on the surface properties is discussed in terms of secondary emission. A non-negligible shift of the secondary electron emission yield, as well as a change of energy distribution of secondary electrons, were measured after Ar+ bombardment. A preliminary study suggests that the effects of He+ and Ar+ are comparable.

Key words

cosmic dust dust charging electron impact secondary emission 
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Copyright information

© Institute of Physics, Academy of Sciences of Czech Republic 2005

Authors and Affiliations

  • P. Zilavy
    • 1
  • I. Richterova
    • 1
  • Z. Nemecek
    • 1
  • J. Safrankova
    • 1
  • J. Pavlu
    • 1
  1. 1.Faculty of Mathematics and PhysicsCharles UniversityPraha 8Czech Republic

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