Absolute ionization cross sections for electron impact on gases relevant to the Earth's atmosphere

Data is provided for electron impact ionization and dissociation of a number of atomic and molecular gases. The species contain the main constitutents and trace gases in the Earth's stratosphere. In this second version we included total cross sections for dissociative electron attachment (providing negative fragment ions) for a number of chlorofluorocarbons and chlorofluoromethanes.The motivation is to provide absolute cross sections to enable the simulation of the interaction of secondary electrons produced by primary extraterrestrial radiation. Such simulations require accurate data for an energy range from low threshold energies up to several hundred electron volts (eV) of energy. Presently simulations to obtain atmospheric ionization densities use W-values which is the average energy required for providing an electron ion pair of the main atmospheric constituents like nitrogen. The data provided can be used to do more detailed and potentially more accurate calculations. Funding Project: 21GRD02 BIOSPHERE The project (21GRD02 BIOSPHERE) has received funding from the European Partnership on Metrology, co-financed by the European Union’s Horizon Europe Research and Innovation Programme and by the Participating States. Funded by the European Union. Contact person: Alexander Dorn, Max Planck Institute for Nuclear Physics, Heidelberg, Germany. Email: [e-mail]