1. Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, European Spallation Source Scandinavia, Lund University, Box 117, SE-221 00 Lund, Sweden, Department of Chemistry, Göteborg University, SE-412 96 Göteborg, Sweden, and Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden