Abstract
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.
Highlights
The emission of atomic and ionic lines represents probably the most studied field of plasma spectroscopy
We hope that the newly-installed Tunable Diode Laser Absorption Spectroscopy (TDLAS) diagnostic [19], which measures the metastable fraction of Ar, combined with the emission measurements of fast atoms, will provide new insights into this excitation mechanism in the near future
Light reflectance at metallic surfaces is a natural phenomena, which was observed in many kinds of laboratory plasmas, including fusion, Grimm-type, or rf-plasma discharges [35,36,37]
Summary
The emission of atomic and ionic lines represents probably the most studied field of plasma spectroscopy. The difference in the intensity and/or shape of emission between the red- and the blue-shifted signal is determined by the optical properties of the mirror. We postulate that the optical properties of the mirror could be derived using the ratio between the red- and the blue-shifted signal of emission [1,2]. Instead of the timely-resolved measurements for the standard calibrating surface and the mirror outside of the plasma, one performs a simultaneous observation using the Doppler effect during plasma operation
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