Plasma Crystal: Coulomb Crystallization in a Dusty Plasma
Aug 1, 1994
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Abstract: (APS)
A macroscopic Coulomb crystal of solid particles in a plasma has been observed. Images of a cloud of 7−μm "dust" particles, which are charged and levitated in a weakly ionized argon plasma, reveal a hexagonal crystal structure. The crystal is visible to the unaided eye. The particles are cooled by neutral gas to 310 K, and their charge is >9800e, corresponding to a Coulomb coupling parameter Γ>20 700. For such a large Γ value, strongly coupled plasma theory predicts that the particles should organize in a Coulomb solid, in agreement with our observations.- 94.10.Nh
- 64.70.-p
- 52.25.-b
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