An independent-atom-model description of ion-molecule collisions including geometric screening corrections Hans Jürgen Lüdde, Alexander Achenbach, Thilo Kalkbrenner, Hans-Christian Jankowiak and Tom Kirchner Eur. Phys. J. D, 70 4 (2016) 82 Published online: 12 April 2016 DOI: 10.1140/epjd/e2016-70097-5