1. School of Chemical Engineering, Department of Chemical and Metallurgical Engineering, Aalto University, P.O. Box 16100, FI-00076 Aalto, Espoo, Finland
2. Department of Chemistry, University of Helsinki, P.O. Box 55, 00014 Helsinki, Finland
3. Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
4. School of Chemical Engineering, Department of Bioproducts and Biosystems, Aalto University, P.O.
Box 16300, FI-00076 Aalto, Espoo, Finland
5. IONTOF GmbH, Heisenbergstr. 15, 48149 Münster, Germany
6. Department of Chemistry, Nanoscience Center, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland