Photoabsorption Spectroscopy in the Vacuum Ultraviolet: Measurements and Modeling of CO and CO2

High-resolution vacuum ultraviolet photoabsorption cross sections of CO2are required for modeling airglow emissions from the Martian and Venusian atmospheres and for photochemical models of those and Earth’s atmospheres. We report cross section measurements between 91000 and 115000 cm−1 (87–108 nm) at spectral resolutions of 1.15 cm−1 (91000 to 102000 cm−1) and 0.58 cm−1 (102000 to 115000 cm−1). These are the first high-resolution cross sections reported in this region, and show significant deviations from the results of previous lower-resolution measurements, particularly in regions with sharp spectral structure.