Measurement of the interaction force among particles in three-dimensional plasma clusters.
The interaction forces between particles have been studied in a 3D plasma cluster under weak external confinement. A suitable combination of dc and rf applied to a small electrode provided gravity compensation, uniform over dimensions much larger than the cluster itself. The forces acting on the particles could be reconstructed due to unique three-dimensional diagnostics, which allow us to obtain coordinates and velocities of all the particles simultaneously. The measurements yield a maximum (external) confinement force of 1.4 x 10(-15)N and interparticle force that is repulsive at short distances and attractive at larger distances, with a maximum attractive force of 2.4 X 10(-14)N at particle separation 195 microm.
Antonova
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Max-Planck Institut für extraterrestrische Physik, D-85740 Garching, Germany.
Annaratone
B M
BM
Goldbeck
D D
DD
Yaroshenko
V
V
Thomas
H M
HM
Morfill
G E
GE