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The European Physical Journal D

, Volume 54, Issue 2, pp 299–304 | Cite as

Secondary electron emission from highly charged carbon grains

  • M. Beránek
  • I. Richterová
  • Z. Němeček
  • J. PavlůEmail author
  • J. Šafránková
Topical issue: 23rd Symposium on Plasma Physics and Technology

Abstract

Surfaces in contact with a plasma can influence its characteristics and, on the other hand, the impact of plasma particles can change surface properties of materials immersed in a plasma. Carbon is often present in plasma systems either as a building material or a product of technological processes, thus its behavior is an important factor of these applications. The paper deals with investigations of secondary emission of 1–6 μm spherical grains from amorphous carbon under the electric field of the order of 108 V/m. We have found that the secondary emission yield increases with the electric field at the sample surface nearly linearly and does not depend on the grain diameter. Long-lasting (hours) electron irradiation of the sample surface leads to a significant decrease of the yield that was attributed to the removal of an absorbed layer from the grain surface. This conclusion is supported by the fact that a similar effect was achieved after several minutes of simultaneous electron and ion treatments.

PACS

79.20.Hx Electron impact: secondary emission 96.50.Dj Interplanetary dust and gas 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • M. Beránek
    • 1
  • I. Richterová
    • 1
  • Z. Němeček
    • 1
  • J. Pavlů
    • 1
    Email author
  • J. Šafránková
    • 1
  1. 1.Charles University, Faculty of Mathematics and PhysicsPragueCzech Republic

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