Abstract
Summary Druyvesteyn's conclusion that the negative glow of the normal glow discharge in neon and argon gives an excitation light has been shown to be in agreement with the similarity of the intensity distribution for Ar I lines in the negative glow and positive column, and also to agree with the electrical analysis of the negative glow. It is pointed out, with special reference to helium, that this conclusion is not necessarily valid for all gases.
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