Abstract
The spatial distribution of the optogalvanic (OG) signal in argon at the 801.489 nm (<TEX>$1s_5-2p_8$</TEX> transition at the metastable level in Paschen notation) was investigated in the radial direction of a hollow cathode discharge tube. The results of this experiment showed that the OG signal amplitude decreases in accordance with the following two conditions; first, the level of discharge current and second, the distance from the cathode dark space. These results can be quantified by analyzing the electron density profile along the discharge regions, which can directly influence the collisional ionization induced by electron impact.
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