Transition from Attractive to Repulsive Forces between Dust Molecules in a Plasma Sheath

Melzer, A.; Schweigert, V. A.; Piel, A.

doi:10.1103/physrevlett.83.3194

Cited by 249 publications

(153 citation statements)

References 21 publications

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“…These data might also be interpreted to imply an attractive interaction. Recently, however, Melzer et al have shown that this behavior is probably due to the attraction of the lower dust particle to an ionrich wake formed by the upper particle [9]. The existence of a wake-mediated mechanism does not preclude an attraction between the particles themselves, but it does show that the observation of interstratum alignment does not imply it.…”

Section: Introductionmentioning

confidence: 88%

The electrostatic interaction of charged, dust-particle pairs in plasmas

Markes

Williams

2000

Physics Letters A

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Section: Introductionmentioning

confidence: 88%

The electrostatic interaction of charged, dust-particle pairs in plasmas

Markes

Williams

2000

Physics Letters A

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“…Takahashi et al (1998) showed by optical manipulation that non-reciprocal effects on particles in the wake region aligned them with the upstream particle [15]. Melzer et al (1999) showed transitions (induced by neutral pressure changes) between attracting and repelling wakes [16], and estimated attracting force on a particle with charge 2000e of 1.6 × 10 −15 N at 40µm horizontal and 750µm vertical separation. Steinberg et al [17] observed identical particles, suspended in a sheath, undergoing transitions between horizontal, vertical, and oblique alignment as the discharge power was varied, as did Samarian et al [18].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear collisionless plasma wakes of small particles

Hutchinson

2011

Physics of Plasmas

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The wake behind a spherical particle smaller than the Debye length (λ De ) in flowing plasma is calculated using a particle-in-cell code. The results with different magnitudes of charge reveal substantial non-linear effects down to values that for a floating particle would correspond to a particle radius approximately 10 −2 λ De . The peak potential in the oscillatory wake structure is strongly suppressed by non-linearity, never exceeding approximately 0.4 times the unperturbed ion energy. By contrast, the density peak arising from ion focusing can be many times the ambient. Strong heating of the ions occurs in the non-linear regime. Direct ion absorption by the particle is not important for the far wake unless the radius exceeds 10 −1 λ De , and is therefore never significant (for the far wake) in the linear regime. Reasonable agreement with full-scale linear-response calculations are obtained in the linear regime. The wake wavelength is confirmed and an explanation, in terms of the conical potential structure, is proposed for experimentallyobserved oblique alignment of different-sized grains.

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“…It is worth noting that the non-uniformity in our model would be higher when the corresponding dipole part of the potential dominates over the monopole part. In the dusty plasmas, the wake effect was experimentally confirmed to be responsible for the attraction of two macroparticles by optical manipulations using radiation pressure from laser light [20,21]. In a sense, the wake means that the microion cloud is unevenly distributed even if it is derived from the dynamic effects.…”

Section: Resultsmentioning

confidence: 98%

“…In the area of dust plasmas, one can observe transitions from a disordered gaseous-like phase to a liquid-like phase and the formation of ordered structures of particles-plasma crystals [14][15][16][17]. The wake effect has been proposed as the most promising candidate for the formation of the dust-plasma crystals [18,19], and it was experimentally confirmed to be responsible for the attraction of two macroparticles by optical manipulations using radiation pressure from laser light [20,21]. Nevertheless, it is found that both the point charge and the dipole moment can be responsible for the wake potential [22].…”

Section: Introductionmentioning

confidence: 99%

The Anisotropic Cell Model in the Colloidal Plasmas

Ye¹,

Lu²

2010

PIER

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Abstract-The anisotropic spherical Wigner-Seitz (WS) cell model -introduced to describe colloidal plasmas -is investigated using the linearized Poisson-Boltzmann (PB) equation. As an approximation, the surface potential of the spherical macroparicle expanded in terms of the monopole (q) and the dipole (p) is considered as an anisotropic boundary condition of the linear PB equation. Here, the "apparent" moments q and p are the moments 'seen' in the microion cloud, respectively. Based on a new physical concept, the momentneutrality, the potential around the macroparticle can be solvable analytically if the relationship between the actual moment and the "apparent" moment can be obtained according to the momentneutrality condition in addition to the usual electroneutrality. The calculated results of the potential show that there is an attractive region in the vicinity of macroparticle when the corresponding dipole part of the potential dominates over the monopole part, and there is an attractive region and a repulsive region at the same time, i.e., a potential well, when the corresponding dipole part of the potential just comes into play. It provides the possibility and the conditions of the appearance of periodic structure of the colloidal plasmas, although it is a result of a simple theoretical model.

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Transition from Attractive to Repulsive Forces between Dust Molecules in a Plasma Sheath

Cited by 249 publications

References 21 publications

The electrostatic interaction of charged, dust-particle pairs in plasmas

The electrostatic interaction of charged, dust-particle pairs in plasmas

Nonlinear collisionless plasma wakes of small particles

The Anisotropic Cell Model in the Colloidal Plasmas

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