Charge distribution of particles in an irradiated dust cloud

Sodha, M. S.; Dixit, Amrit; Srivastava, Shubhi; Mishra, S. K.; Verma, Manisha; Bhasin, Lalita

doi:10.1088/0963-0252/19/1/015006

Cited by 15 publications

(6 citation statements)

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“…[6][7][8][9][10][11][12][13][14][15][16][17][18][19] Sharma et al [20] analysed the non-linear self-modulation of an EM beam in a dusty plasma. [6][7][8][9][10][11][12][13][14][15][16][17][18][19] Sharma et al [20] analysed the non-linear self-modulation of an EM beam in a dusty plasma.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical model for the effect of dust grains on self‐filamentation of a gaussian electromagnetic beam in a fully ionized plasma

Sharma

2018

Contributions to Plasma Physics

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A theoretical model for the effect of dust grains on the self-filamentation of a Gaussian electromagnetic beam propagating in a fully ionized plasma has been developed by employing the energy balance of the plasma constituents, perturbed electron and ion concentrations, and temperature. In this model, neutral atom ionization, re-integration and accumulation of electrons and ions, photoelectric emission of electrons from the surface of dust grains, as well as elastic and charging collisions have also been considered. The effective dielectric constant in the presence of dust grains has been constructed. The effect of temporal growth of dust grains on various plasma parameters for different values of the dust density has been explored. The variation of the beam width with the normalized channel of propagation has been observed for distinct dust densities and dust charge states. It is observed that the non-linearity induced by the effective dielectric constant in the presence of dust grains increases the self-filamentation of the beam, thus enhancing the effective critical power with the dust density. Some of the outcomes of our approach are in line with experimental observations. These outcomes may be useful for explaining space and laboratory plasma experiments as well as for future studies in complex plasmas. KEYWORDScritical power, dusty plasmas, fully ionized plasma, propagation of beam, self-filamentation INTRODUCTIONSeveral investigations [1][2][3][4][5] have been carried out on complex plasmas because of their exclusive characteristics. Especially, self-filamentation has been attracting a lot of of interest in recent years because of the non-linear interaction of an electromagnetic (EM) beam in complex plasmas. Non-linearity appears because of the non-linear radial distribution of the intensity of the beam in complex plasmas and modifies the electron concentration, electron temperature, and dielectric constant. Collisional, relativistic, and ponderomotive non-linearity are the leading factors for carrying out research in the field of plasma applications.Collisional non-linearity appears as a result of heating of the plasma components due to the dissipation of energy of the EM beam propagating through the plasma. The energy gained by the electrons during this process is lost by thermal conduction as well as by electron collisions with ions, dust, and neutral particles. In a fully ionized plasma, the former mechanism becomes predominant because of the higher degree of ionization as 0 ( 2 0 ∕l 2 m ) << 1, where 0 (=2m e /m i ) is the fraction of energy loss due to collisions, m e and m i are the electronic and ionic masses, 0 is the initial width of the beam, and l m is the mean free path of collisions of the electrons.The importance of the subject has been confirmed by various researchers. [6][7][8][9][10][11][12][13][14][15][16][17][18][19] Sharma et al. [20] analysed the non-linear self-modulation of an EM beam in a dusty plasma. They measured the non-linear current density and change in the modulation

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Section: Introductionmentioning

confidence: 99%

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Theoretical model for the effect of dust grains on self‐filamentation of a gaussian electromagnetic beam in a fully ionized plasma

Sharma

2018

Contributions to Plasma Physics

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“…These investigations did not consider photo-detachment of O 2 an important process at mesospheric altitudes. 57,58 The aim of the present paper is restricted to formulating the number and energy balance equations (as in recent papers by our group [59][60][61][62][63][64][65][66][67][68], solving them for realistic [Havnes et al 11 ] values of parameters, and explaining the charge distribution on the particles (listed in Table I) and the change in the electron density, induced by the presence of dust; the corresponding values of electron density, temperature, collision frequency, and diffusivity have also been evaluated. The starting point is a model (Table II) of the mesosphere in the absence of dust, which takes into account, the processes, mentioned herein and predicts an electron density in close agreement with the observed value; incidentally the model predicts an electron temperature a little larger than the observed value.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of polar mesospheric plasma layers: Comparison of theoretical results with observations

et al. 2011

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This paper presents an analytical model for the physical understanding of the charge distribution on ice dust particles in plasma layers of polar mesospheric clouds PMCs (Noctilucent clouds and polar mesospheric summer echoes). For the case of pure ice dust (with high work function), the charging of the particles occurs only because of the accretion of electronic and ionic species on the surface of ice grains. The analysis is based on the number and energy balance of constituents and allows the charge to be only an integral multiple (positive or negative) of the electronic charge. Amongst other interesting results, the theory explains the observed charge distribution on pure ice particles and corresponding reduction of electron density (viz., Bite out) in the PMCs.

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“…It is also worth mentioning some interesting investigations into the charge distribution on particles in dust clouds (absence of a surrounding plasma medium), where thermionic emission [14][15][16][17][18] and photoelectric emission [19] are the source of electron generation. Both the number and energy balance of electrons have been taken into account in these investigations.…”

Section: Introductionmentioning

confidence: 99%

Statistical mechanics of the distribution of charge on particles in complex plasmas

Sodha¹,

Mishra

Misra

2010

Phys. Scr.

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This paper presents an analytical study of the distribution of charge on the particles in a complex plasma; the study is based on statistical mechanics and ensures that the charge on the particles is an integral multiple of the electronic charge. The formulation incorporates both the number and energy balance of electrons/ions. Three specific cases of charging of particles have been considered, namely (i) in a plasma in the absence of electron emission from the particles, (ii) in a complex plasma in thermal equilibrium and (iii) in a complex plasma irradiated by monochromatic radiation, causing photoelectric emission of electrons from the particles. The effect of various parameters on the charge distribution has also been investigated. This paper is in reasonably good agreement with the fluctuation theory for large values of Z (Z e is the charge on a particle). It is seen that under certain conditions, a significant number of oppositely charged particles occur in the complex plasma.

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Charge distribution of particles in an irradiated dust cloud

Cited by 15 publications

References 19 publications

Theoretical model for the effect of dust grains on self‐filamentation of a gaussian electromagnetic beam in a fully ionized plasma

Theoretical model for the effect of dust grains on self‐filamentation of a gaussian electromagnetic beam in a fully ionized plasma

Kinetics of polar mesospheric plasma layers: Comparison of theoretical results with observations

Statistical mechanics of the distribution of charge on particles in complex plasmas

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