Secondary electron emission from highly charged carbon grains
Charles University, Faculty of Mathematics and Physics, V Holešovičkách 2, 18000 Prague, Czech Republic
Corresponding author: a email@example.com
Revised: 14 November 2008
Published online: 5 December 2008
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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009