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Title: Emission of the third continuum of argon excited by a pulsed volume discharge

Abstract

This paper presents the results of the observation of the third continuum band at 190 nm in a pulsed volume discharge at an argon pressure of 0.17-2 bar. The spatial-time kinetics of ultraviolet-visible photorecombination continuum and the third continuum of argon were measured and analyzed for the high- and low-current excitation regimes. Time-resolved imaging experiments with an intensified charge coupled device camera have shown that the second continuum of argon at 127 nm, Ar* lines and photorecombination continuum had a uniform distribution across the positive column of the discharge. However, the third continuum and Ar{sup +}* lines were emitted exclusively from the negative glow zone. This indicates to the existence of runaway electrons, accelerated in the electric field of the cathode layer and retarded in the negative glow zone. These electrons can achieve the energy of the cathode fall potential (130-250 eV). The radiative decay of the Ar{sub 2}{sup 2+} ions, created from Ar{sup 2+} precursors, is modeled. A good agreement has been achieved between the calculated and measured kinetics of the third continuum at different pressures, which supports the assignment of this continuum to the emission of Ar{sub 2}{sup 2+} ions. In contrast to the third continuum, the originmore » of the afterglow emission bands at 190 and 260 nm are connected with carbon-containing contaminants, accumulated inside the discharge chamber. These bands were disappeared during the gas circulation through the getter purifier.« less

Authors:
;  [1]
  1. Institute of Physics, University of Tartu, Riia 142, 51014 Tartu (Estonia)
Publication Date:
OSTI Identifier:
21371266
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 16; Journal Issue: 12; Other Information: DOI: 10.1063/1.3259356; (c) 2009 American Institute of Physics; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; AFTERGLOW; ARGON; ARGON IONS; EMISSION; GLOW DISCHARGES; PLASMA DIAGNOSTICS; POSITIVE COLUMN; RADIATIVE DECAY; RUNAWAY ELECTRONS; CHARGED PARTICLES; DECAY; ELECTRIC DISCHARGES; ELECTRONS; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; FLUIDS; GASES; IONS; LEPTONS; NONMETALS; PARTICLE DECAY; RARE GASES

Citation Formats

Lissovski, A A, and Treshchalov, A B. Emission of the third continuum of argon excited by a pulsed volume discharge. United States: N. p., 2009. Web. doi:10.1063/1.3259356.
Lissovski, A A, & Treshchalov, A B. Emission of the third continuum of argon excited by a pulsed volume discharge. United States. doi:10.1063/1.3259356.
Lissovski, A A, and Treshchalov, A B. Tue . "Emission of the third continuum of argon excited by a pulsed volume discharge". United States. doi:10.1063/1.3259356.
@article{osti_21371266,
title = {Emission of the third continuum of argon excited by a pulsed volume discharge},
author = {Lissovski, A A and Treshchalov, A B},
abstractNote = {This paper presents the results of the observation of the third continuum band at 190 nm in a pulsed volume discharge at an argon pressure of 0.17-2 bar. The spatial-time kinetics of ultraviolet-visible photorecombination continuum and the third continuum of argon were measured and analyzed for the high- and low-current excitation regimes. Time-resolved imaging experiments with an intensified charge coupled device camera have shown that the second continuum of argon at 127 nm, Ar* lines and photorecombination continuum had a uniform distribution across the positive column of the discharge. However, the third continuum and Ar{sup +}* lines were emitted exclusively from the negative glow zone. This indicates to the existence of runaway electrons, accelerated in the electric field of the cathode layer and retarded in the negative glow zone. These electrons can achieve the energy of the cathode fall potential (130-250 eV). The radiative decay of the Ar{sub 2}{sup 2+} ions, created from Ar{sup 2+} precursors, is modeled. A good agreement has been achieved between the calculated and measured kinetics of the third continuum at different pressures, which supports the assignment of this continuum to the emission of Ar{sub 2}{sup 2+} ions. In contrast to the third continuum, the origin of the afterglow emission bands at 190 and 260 nm are connected with carbon-containing contaminants, accumulated inside the discharge chamber. These bands were disappeared during the gas circulation through the getter purifier.},
doi = {10.1063/1.3259356},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 12,
volume = 16,
place = {United States},
year = {2009},
month = {12}
}