Surface states and the charge of a dust particle in a plasma

Details Surface states and the charge of a dust particle in a plasma Surface states and the charge of a dust particle in a plasma

2008-01-07

arxiv.org/abs/0801.0950v2

Phys. Rev. Lett. 101, 175002 (2008)

Physics

Plasma Physics

4 pages, 3 figures, slightly revised manuscript including radius dependence of the particle charge

Scientific paper

10.1103/PhysRevLett.101.175002

We investigate electron and ion surface states of a negatively charged dust particle in a gas discharge and identify the charge of the particle with the electron surface density bound in the polarization-induced short-range part of the particle potential. On that scale, ions do not affect the charge. They are trapped in the shallow states of the Coulomb tail of the potential and act only as screening charges. Using orbital-motion limited electron charging fluxes and the particle temperature as an adjustable parameter, we obtain excellent agreement with experimental data.

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