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Title: Charging of dust particles in an illuminated open complex plasma system

Abstract

This paper presents an investigation of the charging of dust particles in a dusty plasma, irradiated by white light in near space at satellite altitudes. In deference to the recent emphasis on the character of openness in a dusty plasma, the investigation is based on the balance of the number density and energy of electrons, ions, and neutral particles as well as the energy balance of the dust particles and the charge neutrality condition. The accretion of electrons/ions and the emission of electrons by the dust particles, the ionization of neutral particles and the recombination of electrons and ions, and binary collisions between electrons, ions, and neutral atoms are the processes considered herein; the energy exchange associated with these processes has also been considered. The formulation is applicable to dusty plasmas in space and laboratory, where the photoemission of electrons is the dominant mechanism for electron generation. As an illustration a parametric study of the charging of the dust of Cs (cesium) coated bronze, LaB{sub 6}, and CeO{sub 2}, illuminated by solar radiation in a plasma environment, characteristic of day time ionosphere at an altitude of 150 km has been made. The theory is valid when the mean free pathmore » of electrons for accretion by the dust particles is less than the dimensions of the dust clouds.« less

Authors:
;  [1];  [2]
  1. Disha Institute of Management and Technology, Satya Vihar, Vidhan Sabha-Chandra Khuri Marg, Raipur 492 101 (India)
  2. Department of Education Building, Lucknow University, Lucknow 226 007 (India)
Publication Date:
OSTI Identifier:
21371275
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 16; Journal Issue: 12; Other Information: DOI: 10.1063/1.3273073; (c) 2009 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BRONZE; CERIUM OXIDES; CESIUM; DUSTS; ELECTRONS; IONOSPHERE; IONS; LANTHANUM BORIDES; PARAMETRIC ANALYSIS; PLASMA; SOLAR RADIATION; ALKALI METALS; ALLOYS; BORIDES; BORON COMPOUNDS; CERIUM COMPOUNDS; CHALCOGENIDES; CHARGED PARTICLES; COPPER ALLOYS; COPPER BASE ALLOYS; EARTH ATMOSPHERE; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; LANTHANUM COMPOUNDS; LEPTONS; METALS; OXIDES; OXYGEN COMPOUNDS; RADIATIONS; RARE EARTH COMPOUNDS; STELLAR RADIATION; TIN ALLOYS; TRANSITION ELEMENT ALLOYS

Citation Formats

Sodha, Mahendra Singh, Misra, Shikha, and Mishra, S. K. Charging of dust particles in an illuminated open complex plasma system. United States: N. p., 2009. Web. doi:10.1063/1.3273073.
Sodha, Mahendra Singh, Misra, Shikha, & Mishra, S. K. Charging of dust particles in an illuminated open complex plasma system. United States. doi:10.1063/1.3273073.
Sodha, Mahendra Singh, Misra, Shikha, and Mishra, S. K. 2009. "Charging of dust particles in an illuminated open complex plasma system". United States. doi:10.1063/1.3273073.
@article{osti_21371275,
title = {Charging of dust particles in an illuminated open complex plasma system},
author = {Sodha, Mahendra Singh and Misra, Shikha and Mishra, S. K.},
abstractNote = {This paper presents an investigation of the charging of dust particles in a dusty plasma, irradiated by white light in near space at satellite altitudes. In deference to the recent emphasis on the character of openness in a dusty plasma, the investigation is based on the balance of the number density and energy of electrons, ions, and neutral particles as well as the energy balance of the dust particles and the charge neutrality condition. The accretion of electrons/ions and the emission of electrons by the dust particles, the ionization of neutral particles and the recombination of electrons and ions, and binary collisions between electrons, ions, and neutral atoms are the processes considered herein; the energy exchange associated with these processes has also been considered. The formulation is applicable to dusty plasmas in space and laboratory, where the photoemission of electrons is the dominant mechanism for electron generation. As an illustration a parametric study of the charging of the dust of Cs (cesium) coated bronze, LaB{sub 6}, and CeO{sub 2}, illuminated by solar radiation in a plasma environment, characteristic of day time ionosphere at an altitude of 150 km has been made. The theory is valid when the mean free path of electrons for accretion by the dust particles is less than the dimensions of the dust clouds.},
doi = {10.1063/1.3273073},
journal = {Physics of Plasmas},
number = 12,
volume = 16,
place = {United States},
year = 2009,
month =
}
  • Starting with the basic equations of number and energy balance along with charge neutrality it is shown that the charge on the particle versus irradiance of incident radiation plot in a complex plasma, illuminated by radiation with periodic irradiance displays hysteresis.
  • The authors have modified Chow's theory of secondary electron emission (SEE) to take account of the fact that the path length of a primary electron in a spherical particle varies between zero to the diameter or x{sub m} the penetration depth depending on the distance of the path from the centre of the particle. Further by including this modified expression for SEE efficiency, the charging kinetics of spherical grains in a Maxwellian plasma has been developed; it is based on charge balance over dust particles and number balance of electrons and ionic species. It is seen that this effect ismore » more pronounced for smaller particles and higher plasma temperatures. Desirable experimental work has also been discussed.« less
  • In this paper Mie scattering of light by dust particles having Mathis, Rumpl, and Nordsieek power law distribution of size has been incorporated in the formulation of the kinetics of an illuminated complex plasma which takes into account the ionization of neutral atoms by an external agency, ion-electron recombination, photoemission of electrons by the dust particles, and accretion of electrons and ions on the surface of the particles; the number and energy balance of the constituent species has also been taken into account. An interesting conclusion is that unlike the usual case (when Mie scattering is neglected) the charge onmore » a particle is not proportional to the radius and that for certain sets of parameters the smaller particles are negatively charged while the larger particles, carry positive charge.« less
  • An analysis to investigate the effect of the dust particle size and density on the floating potential of the dust particles of uniform radius and other plasma parameters in the bulk region plasma of a RF-discharge in collisionless/collisional regime has been presented herein. For this purpose, the average charge theory based on charge balance on dust and number balance of plasma constituents has been utilized; a derivation for the accretion rate of electrons corresponding to a drifting Maxwellian energy distribution in the presence of an oscillatory RF field has been given and the resulting expression has been used to determinemore » the floating potential of the dust grains. Further, the de-charging of the dust grains after switching off the RF field has also been discussed.« less
  • A systematic theoretical investigation has been carried out on the role of dust charging dynamics on the nature and stability of DIA (Dust Ion Acoustic) mode in complex plasma. The study has been made for both linear and non-linear scale regime of DIA mode. The observed results have been characterized in terms of background plasma responses towards dust surface responsible for dust charge fluctuation, invoking important dusty plasma parameters, especially the ion flow speed and dust size. The linear analyses confirm the nature of instability in DIA mode in presence of dust charge fluctuation. The instability shows a damping ofmore » DIA mode in subsonic flow regime followed by a gradual growth in instability in supersonic limit of ion flow. The strength of non-linearity and their existence domain is found to be driven by different dusty plasma parameters. As dust is ubiquitous in interstellar medium with plasma background, the study also addresses the possible effect of dust charging dynamics in gravito-electrostatic characterization and the stability of dust molecular clouds especially in proto-planetary disc. The observations are influential and interesting towards the understanding of dust settling mechanism and formation of dust environments in different regions in space.« less