Properties of two-dimensional dusty plasma clusters

✍ Scribed by G.E. Astrakharchik; A.I. Belousov; Yu.E. Lozovik

• Book ID: 104337502
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 199 KB
• Volume: 258
• Category: Article
• ISSN: 0375-9601
• DOI: 10.1016/s0375-9601(99)00329-1

✦ Synopsis

A two-dimensional classical cluster of particles interacting through a screened Coulomb potential is studied. This system can be used as a model for 'dusty particles' in high-frequency discharge plasma. For systems consisting of N s 2-40 particles and confined by a harmonic potential we find ground-state configurations, eigenfrequencies and eigenvectors for the normal modes as a function of the Debye screening length R in plasma. Variations in R cause changes in the D D ground-state structure of clusters, each structural rearrangement can be considered as a phase transition of first or second Ž . order with respect to parameter R . Monte Carlo and molecular dynamics are used to study in detail the melting of the D clusters as the temperature is increased. By varying the density and the temperature of plasma, to which the particles are immersed, one can modulate thermodynamical properties of the system, transforming it in a controllable way to an ordered Ž . Ž . crystal-like , orientationaly disordered or totally disordered liquid-like states. The possibility of dynamical coexistence phenomena in small clusters is discussed.