Improving accuracy of Penning gauge spectroscopy for the determination of hydrogen isotope H/D ratios

•Penning gauge spectroscopy of hydrogen and deuterium Balmer-alpha spectral lines was performed in the gas mixture pressures range of 10−6–10−3mbar.•Subsequent measurements for identical gas pressures revealed that the Hα line intensities are systematically higher the Dα line intensities by a factor...

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Bibliographic Details
Published in:Fusion engineering and design 2017-11, Vol.123, p.906-910
Main Authors: Sergienko, Gennady, Esser, Hans Günter, Nonhoff, Marko, Huber, Alexander, Freisinger, Michaele, Linsmeier, Christian
Format: Article
Language:English
Subjects:
Balmer-alpha line emission
Desorption
Deuterium
Emission analysis
Gas mixtures
H alpha line
Hydrogen
Hydrogen isotope gas mixture
Hydrogen isotopes
Isotopes
Line spectra
Mass spectrometry
Molecular chains
Partial pressure
Penning discharge
Penning gauge spectroscopy
Pressure gauges
Spectral emittance
Vacuum gages
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Summary:•Penning gauge spectroscopy of hydrogen and deuterium Balmer-alpha spectral lines was performed in the gas mixture pressures range of 10−6–10−3mbar.•Subsequent measurements for identical gas pressures revealed that the Hα line intensities are systematically higher the Dα line intensities by a factor of about 1.28.•Hα line intensity for hydrogen gas having constant partial pressure is slightly increased with the total gas mixture pressure.•Proposed empirical functions, which take new observations into account, improve essentially the absolute accuracy of the mixture composition measurement. Atomic spectral lines emitted from a Penning discharge are often used to quantify partial pressures and isotopes ratios in gases. To identify the potential of this method for thermal desorption studies, the hydrogen emission spectrum lines (Hα and Dα) were examined by an Alcatel Penning gauge. The hydrogen/deuterium pressures were measured by both a capacitive vacuum gauge and the Penning gauge. Different gas mixtures were produced by varying of hydrogen/deuterium flows. The Balmer-alpha lines intensities were recorded with help of a high etendue spectrometer coupled to the Penning gauge using relay optics together with fiber bundle and equipped with Peltier cooled CCD camera. Subsequent measurements using hydrogen and deuterium gases revealed for identical pressures in the range of 10−6–10−3mbar that the Hα line intensities are systematically higher the Dα line intensities by a factor of 1.28±0.01. This observation can be explained by the dissociative excitation of the molecular hydrogen by electron impact. In addition the Hα line intensity for the H2 gas having constant partial pressure is slightly increased with total gas mixture pressure. Taking into account of both effects essentially improves the accuracy of the determination of partial pressures and isotope H/D ratios.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2017.03.092