Double Electric Layer of a Helium Discharge in Modulation Mode

The positive column of a helium gas discharge in modulation mode has been investigated. It has been revealed that the contribution of the stepwise ionization to population of the 3 1 D 2 level is low due to small population of metastable levels at weak discharge currents (20–100 mA). With increasing...

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Bibliographic Details
Published in:Russian physics journal 2020, Vol.62 (9), p.1685-1694
Main Authors: Gusejnov, T. Kh, Rasulov, É. A., Babaeva, R. F.
Format: Article
Language:English
Subjects:
Condensed Matter Physics
Electric fields
Gas discharges
Hadrons
Heavy Ions
Helium
Ionization
Lasers
Level (quantity)
Line spectra
Mathematical and Computational Physics
Metastable atoms
Modulation
Nuclear Physics
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Plasma
Plasma Physics
Population
Theoretical
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Summary:The positive column of a helium gas discharge in modulation mode has been investigated. It has been revealed that the contribution of the stepwise ionization to population of the 3 1 D 2 level is low due to small population of metastable levels at weak discharge currents (20–100 mA). With increasing discharge current, the metastable atom population increases and hence, the modulation depth of spectral line intensities of metastable levels also increases. At high currents (>100 mA), the modulation depth of spectral line intensities decreases because of saturation of metastable level population.
ISSN:1064-8887
1573-9228
DOI:10.1007/s11182-020-01893-z