CO2 Extinction Coefficient 1700–3000 Å

The CO2 extinction coefficient in the 1700–3000 Å region has been measured using a 2-m spectrometer in conjunction with a multiple-path absorption cell. The results show excellent agreement with other recent observations to a long-wavelength limit of about 1950 Å. At longer wavelengths the present results indicate considerably lower cross sections; the extinction cross section is dominated by Rayleigh scattering in the region longward of 2035 Å, with values determined reasonably accurately by calculations using the measured refractive index and depolarization factor.