Absolute total cross sections for electron-impact double ionization of He(1s2s 3S) and He−(1s2s2p 4P)Matthieu Génévriez, Pierre Defrance, Jozo J. Jureta and Xavier UrbainEur. Phys. J. D, 73 2 (2019) 30DOI: https://doi.org/10.1140/epjd/e2018-90566-y