Infrared spectra of noble gases (10500 to 13000 A)

The first spectra of helium, neon, argon, krypton, and xenon, excited by uncondensed discharges in Geissler tubes, have been explored in the infrared (10500 to 13000 A) with Eastman I-Z photographic plates. In each spectrum new lines have been r ecorded, most of which are accounted for as combinations of established terms, thus confirming the structural analyses of the spectra. Two missing 28 terms are revealed for xenon and possibly one new I-type term each for neon and for argon. Among the stronger lines those which involve accurately determined relative terms may serve as preliminary standards of wave length in the infrared.