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The first spectra of helium, neon, argon, krypton, and xenon, excited by discharges in Geissler tubes, operated by direct connection to a transformer, have been explored in the infrared (12000 to 19000 A). A high-resolution, automatically recording, infrared spectrometer, employing a 15000-lines-per-inch grating and lead-sulfide photoconducting detector, was used as the dispersing instrument. A new set of wavelength values is reported for all these spectra. New data include 18 previously unreported lines of neon and 36 of krypton, all of which have been classified. The descriptions of the spectra of argon, krypton, and xenon represent essentially a repetition of the observations of Sittner and Peck. Several previously missing classifications are supplied, also a few amended interpretations. The analysis-of these spectra may be regarded as complete. Use of selected lines as wavelength standards is suggested..

Infrared spectra of noble gases (12000 to 19000 A)