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Abstract
Doppler free two-photon optogalvanic spectroscopy has been applied to measure the electric field strength in the cathode fall region of a hollow cathode discharge, via the Stark splitting of the 2S level of atomic hydrogen. Important improvements in the experimental arrangement and in our understanding of the discharge, have allowed us to measure accurately the dependence of the electric field with different parameters like the cathode material (stainless steel and tungsten), geometry (10 and 15 mm inner diameter) and the buffer gas. The study is done for different pressures and currents. The first results seem to reveal different behaviour in the electric field, depending on the material and geometry of the cathode and the discharge conditions.
Highlights
Hydrogen plasmas have been studied for many years due to its multiple applications to industry and research
The hydrogen plasmas generated in a hollow cathode discharge (HCD) are plasmas widely used in industry, and as they present low pressure, low kinetic temperature and out the local thermodynamic equilibrium, they result very attractive in order to investigate the application of different diagnosis techniques
We determine the electric field (E-field) in the cathode region in a low-pressure pure hydrogen plasma, generated in a HCD in glow-discharge regime [1, 2], using optogalvanic spectroscopy and the Stark effect in the 1S-2S hydrogen transition
Summary
Optogalvanic spectroscopy applied to the study of hollow cathode discharges devices To cite this article: V Gonzalez-Fernandez et al 2017 J. View the article online for updates and enhancements. - Experimental study of the electric field in a hollow cathode discharge in hydrogen: influence of sputtering V. - Measured cathode fall characteristics depending on the diameter of a hydrogen hollow cathode discharge V Gonzalez-Fernandez, K Grützmacher, A Steiger et al. - Characterization of hollow cathode fall field strength measured by Doppler-free twophoton optogalvanic spectroscopy via Stark splitting of the 2S level of hydrogen and deuterium C Pérez, M I de la Rosa and K Grützmacher
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