The results of a flight with a balloon borne infrared spectrograph are presented. Solar spectra of the region from 1 to 5 µ were obtained at altitudes from 60 000 to 100 000 ft. The atmospheric absorption data obtained from these spectra are compared with theoretical predictions of slant path absorptions and with laboratory data for constant pressure path. It is found that, if the absorption is treated as a function of <i>Pw</i>, the laboratory data and flight data can be fitted by relations of similar form but with different constants.
DAVID G. MURCRAY, JAMES N. BROOKS, FRANK H. MURCRAY, and WALTER J. WILLIAMS, "Atmospheric Absorptions in the Near Infrared at High Altitudes," J. Opt. Soc. Am. 50, 107-112 (1960)