An Interferometric Study of a High-Intensity, Hollow-Cathode Source

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Abstract
Measurements of the profile of the λ 3247.5‐Å copper resonance line emitted from a high‐intensity, hollow‐cathode source of the Sullivan—Walsh type have been made using a pressure‐tuned, Fabry—Perot interferometer. It is found that the enhanced intensity from this source compared with that from a conventional hollow‐cathode source is accompanied by a considerable decrease in the self‐absorption of the resonance line within the source. The line‐profile measurements together with measurements of the decay of the resonance radiation on switching off either the hollow‐cathode discharge or the auxiliary discharge are in qualitative agreement with the hypothesis that the radiation is emitted partly from the hollow‐cathode discharge and partly from the auxiliary discharge.

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