Secondary electron emission from highly charged carbon grains |
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Authors: | M?Beránek I?Richterová Z?Něme?ek J?Pavl? J??afránková |
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Institution: | (1) Charles University, Faculty of Mathematics and Physics, V Holešovičkách 2, 18000 Prague, Czech Republic |
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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. |
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Keywords: | PACS" target="_blank">PACS 79 20 Hx Electron impact: secondary emission 96 50 Dj Interplanetary dust and gas |
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