Vertical pairing of identical particles suspended in the plasma sheath

Details Vertical pairing of identical particles suspended in the plasma sheath Vertical pairing of identical particles suspended in the plasma sheath

2001-04-20

arxiv.org/abs/nlin/0104048v1

Nonlinear Sciences

Chaotic Dynamics

4 pages, 6 figures. to appear in Phys. Rev. Lett. 86, May 14th (2001)

Scientific paper

10.1103/PhysRevLett.86.4540

It is shown experimentally that vertical pairing of two identical microspheres suspended in the sheath of a radio-frequency (rf) discharge at low gas pressures (a few Pa), appears at a well defined instability threshold of the rf power. The transition is reversible, but with significant hysteresis on the second stage. A simple model, which uses measured microsphere resonance frequencies and takes into account besides Coulomb interaction between negatively charged microspheres also their interaction with positive ion wake charges, seems to explain the instability threshold quite well.

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