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Emission of Fast Hydrogen Atoms in a Low Density Gas Discharge—The Most “Natural” Mirror Laboratory

Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung–Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany
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Author to whom correspondence should be addressed.
Current address: Max-Planck-Institut für Plasmaphysik Greifswald, Wendelsteinstr. 1, 17491 Greifswald, Germany.
Current address: Laboratory for Plasma Physics, LPP-ERM/KMS, B-1000 Brussels, Belgium.
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Current address: CEA Cadarache IRFM, 13108 Saint Paul lez Durance–CEDEX, France.
Atoms 2019, 7(3), 81; https://doi.org/10.3390/atoms7030081
Received: 30 June 2019 / Revised: 13 August 2019 / Accepted: 15 August 2019 / Published: 19 August 2019
(This article belongs to the Special Issue Atomic Processes in Plasmas: APiP-2019)
In this work, we present a new application for the line shapes of emission induced by reflected hydrogen atoms. Optical properties of the solids in contact with the plasma could be effectively measured at the wavelength of Balmer lines: time-resolved measurements of reflectance and polarization properties of mirrors are performed using the wavelength separation of the direct and reflected signals. One uses the Doppler effect of emission of atoms excited by collisions with noble gases, primarily with Ar or with Kr. In spite of a new application of line shapes, the question of the source of the strong signal in the case of Ar exists: the emission observed in the case of the excitation of H or D atoms by Ar exceeds the signal induced by collisions with Kr atoms by a factor of five, and the only available experimental data for the ground state excitation show practically equal cross-sections for both gases in the energy range of 80–200 eV. View Full-Text
Keywords: plasma spectroscopy; plasma–surface interaction; optical properties of materials; line shapes of Balmer lines; polarization of light by reflection plasma spectroscopy; plasma–surface interaction; optical properties of materials; line shapes of Balmer lines; polarization of light by reflection
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Marchuk, O.; Dickheuer, S.; Ertmer, S.; Krasikov, Y.; Mertens, P.; Brandt, C.; Brezinsek, S.; Goriaev, A.; Ialovega, M.; Göths, B.; Kreter, A.; Linsmeier, C. Emission of Fast Hydrogen Atoms in a Low Density Gas Discharge—The Most “Natural” Mirror Laboratory. Atoms 2019, 7, 81.

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