Complex plasma: dusts in plasma

Ishihara, Osamu

doi:10.1088/0022-3727/40/8/r01

Cited by 202 publications

(148 citation statements)

References 135 publications

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“…On the other hand, dusty plasmas are found in planetary rings, in-terstellar molecular clouds, protostellar disks, interstellar and circumstellar clouds, asteroid zones, planetary atmospheres, interstellar media, cometary tails, nebula, Earth's ionosphere, etc. [1][2][3][4][5][6][7][8][9]. Now-a-days electrostatic modes in dusty plasmas has become a field of great interest because of their vital role in understanding the dynamics and fragmentation of molecular clouds, star formation, the galactic structure and its evolution, the magnetic reconnection, the spoke formation of Saturn's rings, to name a few [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The effects of vortex like distributed electron in magnetized multi-ion dusty plasmas

Haider¹,

Ferdous

Duha

2014

Open Physics

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Abstract:The nonlinear propagation of small but finite amplitude dust-ion-acoustic solitary waves in a magnetized, collisionless dusty plasma is investigated theoretically. It has been assumed that the electrons are trapped following the vortex-like distribution and that the negatively and positively charged ions are mobile with the presence of charge fluctuating stationary dusts, where ions mass provide the inertia and restoring forces are provided by the thermal pressure of hot electrons. A reductive perturbation method was employed to obtain a modified Korteweg-de Vries (mK-dV) equation for the first-order potential and a stationary solution is obtained. The effect of the presence of trapped electrons, negatively and positively charged ions and arbitrary charged dust grains are discussed. PACS

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Section: Introductionmentioning

confidence: 99%

The effects of vortex like distributed electron in magnetized multi-ion dusty plasmas

Haider¹,

Ferdous

Duha

2014

Open Physics

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“…(60) has a similar structure as the phenomenological expression (13) there are significant differences. First, the microscopic formula contains more than one bound state and depends not only on T s but also on T e .…”

Section: Desorption Timementioning

confidence: 97%

“…The physisorption kinetics at the grain boundary, that is, the sticking in and the desorption from (external) surface states due to inelastic scattering processes, is encoded in the products (sτ ) e,i which we approximated by phenomenological expressions of the form (13). For electrons, we now take a closer look at what happens on the surface microscopically.…”

Section: Physisorption Of Electronsmentioning

confidence: 99%

“…In plasma-physical settings surface charges play a role in atmospheric plasmas, where the charge of nm-sized aerosols [8] is of interest, in space bound plasmas, where surface charges of spacecrafts [9,10] and of interplanetary and interstellar dust particles [11,12] have been extensively studied, and in laboratory dusty plasmas, where the study of self-organization of highly negatively charged, strongly interacting µm-sized dust particles became an extremely active area of current plasma research [13,14,15,16,17,18,19]. Surface charges affect also the physics of dielectric barrier discharges -a discharge type of huge technological impact [20,21,22,23,24,25].…”

Section: Introductionmentioning

confidence: 99%

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Physisorption kinetics of electrons at plasma boundaries

2009

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Abstract. Plasma-boundaries floating in an ionized gas are usually negatively charged. They accumulate electrons more efficiently than ions leading to the formation of a quasi-stationary electron film at the boundaries. We propose to interpret the build-up of surface charges at inert plasma boundaries, where other surface modifications, for instance, implantation of particles and reconstruction or destruction of the surface due to impact of high energy particles can be neglected, as a physisorption process in front of the wall. The electron sticking coefficient se and the electron desorption time τe, which play an important role in determining the quasi-stationary surface charge, and about which little is empirically and theoretically known, can then be calculated from microscopic models for the electron-wall interaction. Irrespective of the sophistication of the models, the static part of the electron-wall interaction determines the binding energy of the electron, whereas inelastic processes at the wall determine se and τe. As an illustration, we calculate se and τe for a metal, using the simplest model in which the static part of the electron-metal interaction is approximated by the classical image potential. Assuming electrons from the plasma to loose (gain) energy at the surface by creating (annihilating) electron-hole pairs in the metal, which is treated as a jellium half-space with an infinitely high workfunction, we obtain se ≈ 10 −4 and τe ≈ 10 −2 s. The product seτe ≈ 10 −6 s has the order of magnitude expected from our earlier results for the charge of dust particles in a plasma but individually se is unexpectedly small and τe is somewhat large. The former is a consequence of the small matrix elements occurring in the simple model while the latter is due to the large binding energy of the electron. More sophisticated theoretical investigations, but also experimental support, are clearly needed because if se is indeed as small as our exploratory calculation suggests, it would have severe consequences for the understanding of the formation of surface charges at plasma boundaries. To identify what we believe are key issues of the electronic microphysics at inert plasma boundaries and to inspire other groups to join us on our journey is the purpose of this colloquial presentation.PACS. 52.27.Lw Dusty or complex plasmas -52.40.Hf Plasma-material interaction, boundary layer effects -68.43.-h Chemi-/Physisorption: adsorbates on surfaces -73.20.-r Electron states at surfaces and interfaces

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“…The presence of macroscopic particles (macroparticles, "dust") significantly modifies plasma properties [1][2][3][4], with visualization of kinetic effects of collective plasma dynamics [5,6]. For example, the "charging" damping appears due to plasma currents on dust particles [7] thus affecting propagation and scattering of electromagnetic waves in such complex plasmas [8,9].…”

Section: Introductionmentioning

confidence: 99%