A NUMBER of investigators, including Merton, Barratt, Johnson, Cameron and others, have shown that the spectrum of an element in the gaseous state can be profoundly modified if an electric discharge be passed through it when one or other of the rare gases helium, neon, argon is mixed in excess with it.
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MCLENNAN, J., MCLEOD, J. & MCQUARRIE, W. On the Oxygen Spectral Line λ = 5577.35 Å.U. Nature 118, 441 (1926). https://doi.org/10.1038/118441a0