Abstract
The optogalvanic line shapes are observed in a commercial hollow cathode discharge tube containing neon buffer gas. Anomalous optogalvanic line shape is particular for transition originating from the 3P 2 (1S 5 in Paschen notation) metastable level of neon. The anomalous line shape is interpreted as being due to two competing atomic processes, which are the collisional ionization and the depletion of metastable atoms. When the competition is almost comparable at discharge current of 15 mA, the differences in the polarity and the magnitude of the optogalvanic signal of the transition result in the anomalous line shape.
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