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Abstract
Experimental evidence has been provided to show that UV radiation produced in the discharge plays a predominant role in a self-maintained glow discharge in hollow cylindrical cathodes. It is shown that a glow discharge current flows in a hollow cylindrical cathode at a voltage much lower than its breakdown value if UV photons from a similar source, running under similar conditions, strike on the hollow cathode. Experiments have been done in air, oxygen, nitrogen and methane at 0.1, 0.08 and 0.05 torr.