An account is given of the infrared solar spectrum from 3.0 to 5.2 obtained at the Ohio State University with a high-resolution, Pfund-type grating spectrometer of 1 meter focal length and a relative aperture off/S. A Perkin-Elmer thermocouple and thirteen-cycle-per-second amplifier were used in the detecting system. Many features of the spectrum are discussed, and a map is presented, together with a table of wave lengths, frequencies, and line identifications where possible. Among the bands and lines identified are those of H , HLO, CO3, CO, CH4, and N .
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Shaw et al. (1951) studied this question.