3.強結合ダストプラズマの結晶化と遷移(<小特集>ダストプラズマの現状と課題)

概要

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In glow discharge plasmas, fine dust particles are negatively charged with thousands of elementary electric charges and can be easily ordered like a crystal, i.e., to form a Coulomb crystal. This report describes recent studies on the structures and transition of these crystals. To date, body-centered cubic, face-centered cubic, simple-hexagonal, and hexagonally close-packed crystals have been described. Three-dimensional Coulomb crystals are here shown to change to two-dimensional, simple-hexagonal crystals with the growth of particles. It has been suggested that an attractive force acts on particles in the direction perpendicular to an electrode. It is further demonstrated that a two-dimensional Coulomb crystal melts, with the decrease of gas pressure or the increase of discharge power, through the hexatic phase and flow and floe states.
社団法人プラズマ・核融合学会の論文
1997-11-25