Room temperature photoabsorption cross section measurements of CO2 between 91,000 and 115,000 cm−1

High-resolution vacuum ultraviolet photoabsorption cross sections of CO2 are required for accurate modeling of airglow emissions from the Martian and Venusian atmospheres and for photochemical models of those and Earth's atmospheres. We report cross section measurements between 91,000 and 115,000 cm−1 (87-110 nm) at spectral resolutions of 1.15 cm−1 (91,000-102,000 cm−1) and 0.58 cm−1 (102,000-115,000 cm−1). These high-resolution cross sections show significant deviations from the results of previous lower-resolution measurements, particularly in regions with sharp spectral structure.

► Room temperature photoabsorption cross sections measurements of CO2 between 91,000 and 115,000 cm−1. ► Unprecedented spectral resolution of 0.58 cm−1 in the region between 102,000 and 115,000 cm−1 is able to resolve all spectral features. ► Measurements take advantage of the VUV-FTS at the Soleil Synchrotron facility in France, which provides very high resolution at high energies.