The rotation of NO3− as a probe of molecular ion - water interactions J. Thøgersen, J.B. Nielsen, S. Knak Jensen, S.R. Keiding, M. Odelius, T. Ogden, J. Réhault and J. Helbing EPJ Web of Conferences, 41 (2013) 06002 Published online: 13 March 2013 DOI: 10.1051/epjconf/20134106002