Solar occultation spectra obtained with a balloon-borne interferometer have been used to study continuous absorption by N2 and CO2 near 2400 cm−1 in the lower stratosphere. Synthetic continuum transmittances, calculated from published coefficients for far-wing absorption by CO2 lines and for pressure-induced absorption by the fundamental band of N2, are in fair agreement with the observed stratospheric values. The continuum close to the ν3R-branch band head of CO2 is sensitive to the CO2 far-wing line shape. Therefore, given highly accurate knowledge of the N2 continuum from laboratory data, high-resolution stratospheric spectra provide a sensitive means for in situ testing of various air-broadened CO2 line shapes at low temperatures.
© 1981 Optical Society of America
Original Manuscript: June 22, 1981
Published: December 15, 1981
Curtis P. Rinsland, Mary Ann H. Smith, James M. Russell, Jae H. Park, and Crofton B. Farmer, "Stratospheric measurements of continuous absorption near 2400 cm−1," Appl. Opt. 20, 4167-4171 (1981)