Selective Radiation From Various Substances, IV (Classic Reprint) - Softcover

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Excerpt from Selective Radiation From Various Substances, IV
The luminous efficiency of vacuum tube radiation (air,10 nitrogen, carbon dioxide, helium, etc.) is of the order of 15 to 20 per cent, or perhaps even much lower, owing to the great amount of infra-red radiations emitted. In marked contrast with these gases is neon, in which the infra-red is almost entirely absent, so that its luminous efficiency is of the order of 80 to 90 per cent. The color of this light is a rich crimson.
In conclusion, it may be noticed that the spectrum of neon is composed of numerous fine lines, more than 60 of which lie between the red and yellow helium lines (o. And With a larger dispersion the shape of the curve will necessarily change until, when final resolution is attained, each spectral line will give a more symmetrical energy curve, as observed (fig. 4) at for helium. There is sufficient reason for believing that the emission lines in neon are just as numerous at to as they are in the visible spectrum, so that whatever the dispersion, the same energy distribution will obtain as here observed, viz, that the strongest lines occur in the region of to of the visible spectrum. In this respect, as already stated, neon is unique.
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