Photoabsorption and Photoionization Cross Sections of O, O2, and N2 for Photoelectron Production Calculations: A Compilation of Recent Laboratory Measurements

摘要

Recent laboratory measurements of photoionization cross section s and ion state branching ratios for atomic oxygen, molecular nitrogen and molecular oxygen are combined with theoretical cross sections for soft x-ray absorption and tabulated for use in atmospheric photoionization calculations. The most important changes from earlier compilations for aeronomical calculations is a factor of approximately two reduction in the absorption and ionization cross section of atomic oxygen between 100 angstroms and 300 angstroms, and a detailed treatment of partial cross sections for the dissociating state of N2 and O2. The results are tabulated on the wavelength scale of the Atmospheric Explorer solar reference spectrum SC 21REFW (Hinteregger et al., 1981).