Physisorption kinetics of electrons at plasma boundaries

Details Physisorption kinetics of electrons at plasma boundaries Physisorption kinetics of electrons at plasma boundaries

2009-01-30

arxiv.org/abs/0901.4915v2

Eur. Phys. J. D 54, 519-544 (2009)

Physics

Plasma Physics

accepted version, 30 pages, 14 figures

Scientific paper

10.1140/epjd/e2009-00213-7

Plasma-boundaries floating in an ionized gas are usually negatively charged. They accumulate electrons more efficiently than ions which leads to the formation of a quasi-stationary electron film at the boundaries. We propose, in a colloquial manner, a physisorption-inspired quantum-kinetic description of the build-up of surface charges at inert plasma boundaries and calculate the electron sticking coefficient and the electron desorption time, which play an important role in determining the quasi-stationary surface charge, and about which little is empirically and theoretically known, from a microscopic model for the electron-wall interaction. In an exploratory calculation we specifically consider a metallic boundary. But thereby we identify quite generally what we believe are the key issues of the electronic microphysics at inert plasma boundaries in the hope to inspire other groups to join us on our journey.

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