Influence of the energy spectrum of electrons ejected from the cathode on electron behaviour in the cathode sheath region of a dc glow discharge in helium and in argon

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Abstract

A multibeam electron flux model has been used to investigate the influence of a key input parameter, namely the energy spectrum of electrons released from the cathode via secondary emission, on electron behaviour in the cathode sheath region of a DC glow discharge in helium and in argon. By comparing the experimental results of Gill and Webb with those predicted by the model for a helium glow discharge, it is found that the structure of the high-energy region of the energy distribution of electron flux can be explained by assuming the electrons are released from the cathode with a range of energies between 0 and 14 eV, and experience only inelastic collisions during subsequent acceleration through the cathode sheath. The gross features of the electron multiplication in the cathode sheath are found to be relatively insensitive to the choice of the initial energy spectrum of the electrons.

LanguageEnglish
Pages198-201
Number of pages4
JournalJournal of Physics D: Applied Physics
Volume25
Issue number2
DOIs
Publication statusPublished - 14 Feb 1992

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Helium
Argon
Glow discharges
sheaths
glow discharges
Cathodes
energy spectra
cathodes
helium
argon
Electrons
electron flux
electrons
inelastic collisions
secondary emission
Secondary emission
Fluxes
multiplication
energy distribution
direct current

Cite this

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title = "Influence of the energy spectrum of electrons ejected from the cathode on electron behaviour in the cathode sheath region of a dc glow discharge in helium and in argon",
abstract = "A multibeam electron flux model has been used to investigate the influence of a key input parameter, namely the energy spectrum of electrons released from the cathode via secondary emission, on electron behaviour in the cathode sheath region of a DC glow discharge in helium and in argon. By comparing the experimental results of Gill and Webb with those predicted by the model for a helium glow discharge, it is found that the structure of the high-energy region of the energy distribution of electron flux can be explained by assuming the electrons are released from the cathode with a range of energies between 0 and 14 eV, and experience only inelastic collisions during subsequent acceleration through the cathode sheath. The gross features of the electron multiplication in the cathode sheath are found to be relatively insensitive to the choice of the initial energy spectrum of the electrons.",
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