Single- and two-photon absorption laser-induced fluorescence spectroscopy in rare gases for gridded ion thruster diagnosticsChristoph Eichhorn, Lukas Pietzonka, Frank Scholze, Carsten Bundesmann, Daniel Spemann, Horst Neumann and Hans J. LeiterEPJ Techn Instrum, 9 1 (2022) 2DOI: https://doi.org/10.1140/epjti/s40485-022-00077-y