Self-trapping of negative ions due to electron detachment in the afterglow of electronegative gas plasmas

I. D. Kaganovich; B. N. Ramamurthi; Demetre J. Economou

doi:10.1063/1.126492

Self-trapping of negative ions due to electron detachment in the afterglow of electronegative gas plasmas

I. D. Kaganovich
, B. N. Ramamurthi
, Demetre J. Economou

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

The spatiotemporal evolution of charged species densities and wall fluxes during the afterglow of an electronegative discharge has been investigated. It was found that plasma decay crucially depends on the product of negative-ion-detachment frequency (γ_d) and diffusion time τ_d. If γ_dτ_d>2, negative ions convert to electrons during their diffusion towards the walls. The presence of detached electrons results in "self-trapping" of the negative ions, due to emerging electric fields, and the negative-ion flux to the walls is extremely small. Thus, negative ions can be extracted in the afterglow only if γ_dτ_d<2.

Original language	English (US)
Pages (from-to)	2844-2846
Number of pages	3
Journal	Applied Physics Letters
Volume	76
Issue number	20
DOIs	https://doi.org/10.1063/1.126492
State	Published - May 15 2000
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.126492

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title = "Self-trapping of negative ions due to electron detachment in the afterglow of electronegative gas plasmas",

abstract = "The spatiotemporal evolution of charged species densities and wall fluxes during the afterglow of an electronegative discharge has been investigated. It was found that plasma decay crucially depends on the product of negative-ion-detachment frequency (γd) and diffusion time τd. If γdτd>2, negative ions convert to electrons during their diffusion towards the walls. The presence of detached electrons results in {"}self-trapping{"} of the negative ions, due to emerging electric fields, and the negative-ion flux to the walls is extremely small. Thus, negative ions can be extracted in the afterglow only if γdτd<2.",

author = "Kaganovich, \{I. D.\} and Ramamurthi, \{B. N.\} and Economou, \{Demetre J.\}",

year = "2000",

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doi = "10.1063/1.126492",

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journal = "Applied Physics Letters",

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T1 - Self-trapping of negative ions due to electron detachment in the afterglow of electronegative gas plasmas

AU - Kaganovich, I. D.

AU - Ramamurthi, B. N.

AU - Economou, Demetre J.

PY - 2000/5/15

Y1 - 2000/5/15

N2 - The spatiotemporal evolution of charged species densities and wall fluxes during the afterglow of an electronegative discharge has been investigated. It was found that plasma decay crucially depends on the product of negative-ion-detachment frequency (γd) and diffusion time τd. If γdτd>2, negative ions convert to electrons during their diffusion towards the walls. The presence of detached electrons results in "self-trapping" of the negative ions, due to emerging electric fields, and the negative-ion flux to the walls is extremely small. Thus, negative ions can be extracted in the afterglow only if γdτd<2.

AB - The spatiotemporal evolution of charged species densities and wall fluxes during the afterglow of an electronegative discharge has been investigated. It was found that plasma decay crucially depends on the product of negative-ion-detachment frequency (γd) and diffusion time τd. If γdτd>2, negative ions convert to electrons during their diffusion towards the walls. The presence of detached electrons results in "self-trapping" of the negative ions, due to emerging electric fields, and the negative-ion flux to the walls is extremely small. Thus, negative ions can be extracted in the afterglow only if γdτd<2.

UR - https://www.scopus.com/pages/publications/0000581633

UR - https://www.scopus.com/pages/publications/0000581633#tab=citedBy

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DO - 10.1063/1.126492

M3 - Article

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SN - 0003-6951

VL - 76

SP - 2844

EP - 2846

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 20

ER -

Self-trapping of negative ions due to electron detachment in the afterglow of electronegative gas plasmas

Abstract

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