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Feb 2013

Volume 20, Issue 2, Articles (02xxxx)

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Phys. Plasmas 20, 022303 (2013); http://dx.doi.org/10.1063/1.4790639 (12 pages)

Julio J. Martinell and Diego del-Castillo-Negrete
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back to top Dusty Plasmas

Binding energy levels of a slowly moving ion in dusty plasmas

Hongwei Hu and Fuli Li

Phys. Plasmas 20, 023701 (2013); http://dx.doi.org/10.1063/1.4789881 (12 pages)

Online Publication Date: 4 February 2013

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The near field electric potential of a slowly moving ion in complex plasmas is studied. We find that the potential consists of the Debye-Hückel potential, the wake potential, and the potential associated with charge fluctuations. The binding energy levels of the ion are calculated by use of the Ritz variation method. The results show that the binding energy levels are related to the magnetic quantum number m. The binding energy levels are affected by speed of the ion and dust grain number density. In contract to isolated ion or static ion in plasmas, the binding energy levels of the ion are pushed up and even become unbounded.
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52.27.Lw Dusty or complex plasmas; plasma crystals
52.25.Fi Transport properties
52.25.Gj Fluctuation and chaos phenomena

Screening in weakly ionized dusty plasmas; effect of dust density perturbations

P. Tolias and S. Ratynskaia

Phys. Plasmas 20, 023702 (2013); http://dx.doi.org/10.1063/1.4789886 (8 pages)

Online Publication Date: 4 February 2013

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The screening of the charge of a non-emitting dust grain immersed in a weakly ionized dusty plasma is studied on the basis of a self-consistent hydrodynamic description. The dust number density is considered large enough so that the test grain is not isolated from other grains and dust collective effects are important. Not only dust charge perturbations but also dust density perturbations are taken into account, the latter are shown to have a strong effect on both the short and long range part of the potential. The realization of collective attraction via the newly obtained potential is discussed, a mechanism that could be central to the understanding of phase-transitions and self-organization processes in dusty plasmas.
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52.27.Lw Dusty or complex plasmas; plasma crystals

Effective charge and effective radius of water droplet in dropwise cluster

A. V. Shavlov, S. N. Romanyuk, and V. A. Dzhumandzhi

Phys. Plasmas 20, 023703 (2013); http://dx.doi.org/10.1063/1.4792260 (5 pages)

Online Publication Date: 14 February 2013

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A particle with large electric charge Z (Z ≫ 1) and radius R0 inserted into plasma is surrounded by a plasma shell, which is stable to weak and short-term external exposures. As a result, during experiments the particle can reveal an effective charge Z* lower than the true one (Z* ≤ Z), and an effective radius R* larger than the true one (R* ≥ R0). The effective electric charge and the effective radius of a water droplet in a dropwise cluster have been calculated using the Poisson-Boltzmann equation. It has been recognized that these parameters are not the function of a droplet's true charge, but are the function of a droplet's true size and the Debye's radius of the plasma. Experimental data on the droplet properties in a dropwise cluster have been explained.
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52.27.Lw Dusty or complex plasmas; plasma crystals
02.30.Jr Partial differential equations

The effects of the ionization, the recombination, and the collision of the ions to the damping solitary waves in a dusty plasma

Xue Yang, Juan-Fang Han, Cong-Bo Liu, Yu-Ren Shi, Sheng-Qian Ma, Xue-Ren Hong, Wen-Shan Duan, and Lei Yang

Phys. Plasmas 20, 023704 (2013); http://dx.doi.org/10.1063/1.4793452 (5 pages)

Online Publication Date: 21 February 2013

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By considering the ionization and recombination of the ions, as well as the collision between ions and dust grains, we have studied the damping solitary wave solution in a dusty plasma. In this paper, we find that the damping rate of the solitary wave increases as both the mass and the density of the dust grains increase. However, it decreases as the charge of the dust grain increases.
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52.27.Lw Dusty or complex plasmas; plasma crystals
52.35.Sb Solitons; BGK modes
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions

Dust-acoustic solitary waves in dusty plasmas with non-thermal ions

H. Asgari, S. V. Muniandy, and C. S. Wong

Phys. Plasmas 20, 023705 (2013); http://dx.doi.org/10.1063/1.4793743 (3 pages)

Online Publication Date: 26 February 2013

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Most studies on dusty plasmas have assumed that electrons and ions follow Maxwellian distributions. However, in the presence of energetic ions, the distribution of ions tends to be non-Maxwellian. It is shown here that the existence of non-thermal ions would increase the phase velocity of a dust-acoustic wave. It is also found that the change in the phase velocity profoundly affects the characteristics of a dust-acoustic solitary wave.
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52.27.Lw Dusty or complex plasmas; plasma crystals
52.35.Sb Solitons; BGK modes
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)
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