Jonas Johansson,^a,* Staffan Folestad,^a Christoffer Abrahamsson,^b Tomas Svensson^b and Stefan Andersson-Engels^b
aPharmaceutical and Analytical R & D, AstraZeneca R & D, Mölndal, Sweden
^bDepartment of Physics, Lund Institute of Technology, Lund, Sweden