Luminous layers in neon were first discovered in 1923 by Holst and Oosterhuis, and several studies have been reported. In order to understand the principle of the phenomenon, we have observed the spatial distribution of emission intensity and the current-voltage characteristics using a low pressure discharge tube. We have also carried out a Monte-Carlo simulation and found a good agreement between the simulated and measured intensity distributions. It was found that the instability in the negative current-voltage characteristics are related to the change of the number of luminous layers.
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