Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 5, Pages 891-894Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.891
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The interaction potential of two microspheres that are levitated in the sheath region of a radio frequency (rf) argon discharge is studied experimentally by analyzing their trajectories during head-on collisions. It is shown that the interaction parallel to the sheath boundary can be described by a screened Coulomb potential. Thus, values for an effective charge and a screening length can be obtained. The horizontal part of the interaction potential has been determined for several plasma conditions. There is no evidence for an attractive part in the potential within the accuracy of the present measurements and the given plasma conditions.
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