Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11g3013y&link_type=abstract
New Journal of Physics, Volume 11, Issue 7, pp. 073013 (2009).
Physics
10
Scientific paper
A modification of the classical Bohm sheath criterion is investigated in complex plasmas containing Boltzmann electrons, cold fluid ions and strongly coupled microparticles. Equilibrium is provided by an effective 'temperature' associated with electrostatic interactions between charged grains. Using the small-potential expansion approach of the Sagdeev potential, a significant reduction of the ion Bohm velocity is obtained for complex plasma parameters relevant for experiments. The result is of consequence for all problems involving ion drag on microparticles, including parametric instability, structure formation, wave propagation, etc.
Morfill Gregor E.
Thomas Hubertus M.
Verheest Frank
Yaroshenko Victoria V.
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