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Title: Spontaneous pairing and cooperative movements of micro-particles in a two dimensional plasma crystal

In an argon plasma of 20 W rf discharge at a pressure of 1.38 Pa, a stable highly ordered monolayer of microparticles is suspended. We observe spontaneous particle pairing when suddenly reducing the gas pressure. Special types of dynamical activity, in particular, entanglement and cooperative movements of coupled particles have been registered. In the course of the experiment first appeared single vertical pairs of particles, in further they gradually accumulated causing melting of the entire crystal. To record pairing events, the particle suspension is side-view imaged using a vertically extended laser sheet. The long-lasting pre-melting phase assured the credible recording and identification of isolated particle pairs. The high monolayer charge density is crucial to explain the spontaneous pairing events observed in our experiments as the mutual repulsion between the particles comprising the monolayer make its vertical extend thicker.
Authors:
 [1] ;  [2] ; ;  [3] ;  [1] ;  [4]
  1. Max Planck Institute for extraterrestrial Physics, D-85741 Garching (Germany)
  2. CNRS, Université d'Aix-Marseille, PIIM UMR 7345, 13397 Marseille Cedex 20 (France)
  3. Forschungsgruppe Komplexe Plasmen, Deutsches Zentrum fur Luft-und-Raumfahrt, Oberpfaffenhofen (Germany)
  4. (Russian Federation)
Publication Date:
OSTI Identifier:
22410361
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ARGON; CHARGE DENSITY; CRYSTALS; ELECTRIC DISCHARGES; IMAGES; LASERS; MELTING; PARTICLES; PLASMA; QUANTUM ENTANGLEMENT; RADIOWAVE RADIATION; SHEETS; TWO-DIMENSIONAL SYSTEMS