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Melting of 2D Coulomb clusters in dusty plasmas
Ryuta Ichiki 1, Yuriy Ivanov 2, Matthias Wolter 2, Yoshinobu Kawai 1, André Melzer 2
(2004-10-20)

The melting of 2D dust clusters caused by one additional particle in the lower layer has experimentally been observed to undergo a two-step transition, which divides the phase of the cluster into three stages. The first transition is a jump of the dust kinetic energy due to the onset of an instability of the lower-layer particle, shifting the cluster from an ordinary to a hot crystalline state. The second transition is the actual phase transition into a liquid state, which occurs at a decisively lower gas pressure. The detailed dynamical properties of the system during the transition were determined in terms of the normal mode analysis.
1:  Interdisciplinary Graduate School of Engineering Sciences
Kyushu University
2:  Institut für Physik
Ernst-Moritz-Arndt-Universität Greifswald
Physics/Physics/Plasma Physics
complex plasma – plasma crystal – melting
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