Absolute absorption cross-section measurements of ozone in the wavelength region 238–335 nm and the temperature dependence

Abstract Laboratory measurements of the absolute absorption cross-section of ozone at the temperatures 195, 228 and 295 K have been made at several discrete wavelengths in the region 238–335 nm. Our results for ozone at 295 K are in excellent agreement with those of Hearn (1961, Proc. phys. Soc. Land. 78 , 932), who used a different technique. Our absolute cross-section measurements of ozone at 195 K have been used to put our recent relative cross-section measurements at that temperature (Freeman et al., 1984, Planet. Space Sci. 32 , 239) on a firm absolute basis throughout the region 240–335 nm; these recalibrated cross-sections are available as numerical compilations on magnetic tape from the National Space Science Data Center, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A.