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Scheme of experimental setup. TT: temperature tuning, CS: current scanning, AL: aspheric lens, NDF: neutral density filter, SM: step motor, and PD: photo diode.
Axial distribution of OG signal in abnormal glow discharge. Discharge conditions: , , and . Patterned bar represents the ends of CF region for given discharge conditions.
Profiles of OG signals that change sign, recorded in cathode fall–negative glow boundary region. and .
(a) Typical experimental absorption profile. Discharge condition: and . (b) The reference Fabry-Pérot fringes. (c) Absorption profile with Gaussian best fit.
Axial distribution of temperature in abnormal glow discharge. Squares: and . Triangles: and . Open symbols: absorption and Solid symbols: OGS. Patterned bar represents the ends of CF region for given discharge conditions.
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