Sheath Criterion for a Collisional Electronegative Plasma Sheath in an Applied Magnetic Field

Xiu, Zou; Liu, Huiping; Qiu, Minghui; Sun, Xiaohang

doi:10.1088/0256-307x/28/12/125201

Cited by 9 publications

(6 citation statements)

References 23 publications

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“…The structure of the plasma sheath plays an important role in many processes such as plasma etching and material surface modification. Therefore, relevant theoretical and experimental research works are still a special topic of interest [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. These works have studied many plasma sheath layers with different physical conditions, such as the collision between ions and neutral particles, ion temperature and applied magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…In these research works, it is assumed that both the electron and negative ion satisfy the Boltzmann distribution at low pressure [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In 2009, Ghim and Hershkowitz [4] proved that the negative ions follow the Boltzmann distribution through experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Zhao et al [9] studied the influence of negative ions on the Bohm criterion of the non-collision plasma sheath and believed that the critical value of the ion Mach number would decrease with the increase of the charge carried by the negative ion. We also have done a lot of research on the electronegative magnetized plasma sheath [7,[10][11][12][13][14]. The main conclusion is that the magnetic field has great effects on the plasma sheath structure.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The structure of an electronegative magnetized plasma sheath with non-extensive electron distribution

Xiu¹,

Liu²,

Zhu³

et al. 2020

Plasma Sci. Technol.

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In this paper, an electronegative magnetized plasma sheath model with non-extensive electron distribution is established, and the Bohm criterion affected by the non-extensive parameter q is theoretically derived. The ion Mach number varies with q. The numerical simulation results show that compared with electronegative magnetized plasma sheath with Maxwell distribution (q=1), the sheath structures with super-extensive distribution (q<1) and sub-extensive distribution (q>1) are different. The physical quantities including the sheath potential distribution, ion density distribution, the electron density distribution, negative ion density distribution and the net space charge density distribution are discussed. It is shown that the non-extensive parameter q has a significant influence on the structure of the electronegative magnetized plasma sheath. Due to the Lorentz force, both the magnitude and the angle of the magnetic field affect the structure of the sheath, whether the electrons are Maxwell distributed or non-extensively distributed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The structure of an electronegative magnetized plasma sheath with non-extensive electron distribution

Xiu¹,

Liu²,

Zhu³

et al. 2020

Plasma Sci. Technol.

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“…Plasmas with a significant amount of negative ions whose contribution cannot be neglected in any way, are known as electronegative plasmas (ENPs). [1][2][3][4][5][6][7] ENPs have attracted a great deal of attention not only because of their potential applications in microelectronic and photoelectronic industries [8] but also because of their occurrence in both laboratory devices, [9][10][11] and space environments. [12][13][14] The ENPs observed in both space and laboratory devices, are not pure in general.…”

Section: Introductionmentioning

confidence: 99%

Cylindrical and spherical Gardner solitons and double layers in a dusty electronegative non-thermal plasma with two-temperature electrons

Akhter¹,

Hossain²,

Mamun³

2013

Chinese Phys. B

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A precise theoretical investigation has been made on the cylindrical and spherical (nonplanar) Gardner solitons (GSs) and double layers (DLs) in a dusty electronegative plasma (composed of inertial positive and negative ions, Maxwellian cold electrons, non-thermal hot electrons, and negatively charged static dust). The reductive perturbation method has been used in derivation of the modified Gardner (MG) equation describing the nonlinear propagation of the dust ion-acoustic (DIA) waves. The MG equation admits solitary waves (SWs) and DLs solutions for σ around its critical value σ c (where σ c is the value of σ corresponding to the vanishing of the nonlinear coefficient of the Korteweg de-Vries (K-dV) equation).The nonplanar SWs and DLs solutions are numerically analyzed and the parametric regimes for the existence of the positive as well as negative SWs and negative DLs are obtained. The basic features of nonplanar DIA SWs and DLs, which are found to be different from planar ones, are also identified. The implications of our results to different space and laboratory dusty plasma situations, are discussed.

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“…For example, Wang et al 12 investigated sheath structure in a collisionless electronegative plasma consisting of electrons, cold positive ions and hot negative ions. Also, the sheath criterion for a magnetized collisional electronegative plasma consists of hot electrons, hot negative ions and cold positive ions was investigated by Zou et al 13 . Furthermore, considering the thermal effect of positive ions, the generalized Bohm criterion for a collisonless two-component electron-ion plasma was formulated by Dubinov and Senilov 14 .…”

mentioning

confidence: 99%

Sheath properties in active magnetized multi-component plasmas

Hatami

2021

Sci Rep

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Multi-component active plasmas are modeled in the presence of a constant oblique magnetic field by using the hydrodynamics equations. Assuming the electrons and negative ions have Boltzmann distribution and the positive ions have finite temperature, the sheath formation criterion is derived by analyzing the Sagdeev potential. It is found that the Bohm velocity of positive ions depends sensitively on the plasma parameters such as ion-neutral collision frequency, electron impact ionization frequency, positive and negative ion temperatures, initial densities of the charged particles and direction of the applied magnetic field. Also, using our obtained Bohm criterion, the sheath properties of an active magnetized plasma consisting of electrons and positive and negative ion species are investigated numerically and the results are compared with the results of a similar quiescent plasma.

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Sheath Criterion for a Collisional Electronegative Plasma Sheath in an Applied Magnetic Field

Cited by 9 publications

References 23 publications

The structure of an electronegative magnetized plasma sheath with non-extensive electron distribution

The structure of an electronegative magnetized plasma sheath with non-extensive electron distribution

Cylindrical and spherical Gardner solitons and double layers in a dusty electronegative non-thermal plasma with two-temperature electrons

Sheath properties in active magnetized multi-component plasmas

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