Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 44, Issue 20, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/44/20/205204
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Funding
- DGF [WI 1700/3-1]
- Humboldt Foundation
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Zero-dimensional, space-averaged global models of argon dust-free and dusty afterglow plasmas are developed, which describe the time behaviour of electron n(e)(t) and Ar* metastable n(m)(t) densities. The theoretical description is based on the assumption that the free electron density is smaller than the dust charge density. In pure argon, fairly good agreement with the experimentally measured densities and their decay times in the afterglow is obtained when the electron energy loss term to the chamber walls is included in the electron energy balance equation. In dusty plasma afterglow, the agreement between theory and experiment is less satisfactory. The calculated metastable density is 3 times smaller than the measured one and the electron decay is much faster in the late afterglows. The difference should probably arise from the assumption that the electron energy distribution function is Maxwellian. Different sources of secondary electrons in the dusty plasma afterglow are analysed. Comparison of the model with experimental results of argon dusty plasma suggests that the metastable pooling could be the source of the experimentally observed electron density increase in the early afterglow but electron generation from metastable-dust interactions cannot be fully discarded.
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