1. Science & Technology Department IBM Research Europe ‐ Zurich Säumerstrasse 4 Rüschlikon CH‐8803 Switzerland
2. Department of Biosystems Science and Engineering ETH Zürich Mattenstrasse 26 Basel 4058 Switzerland
3. Physics Institute Space Research & Planetary Sciences University of Bern Sidlerstrasse 5 Bern CH‐3012 Switzerland
4. Department of Chemistry University of Basel St. Johanns‐Ring 19 Basel CH‐4056 Switzerland
5. EMPA Swiss Federal Laboratories for Materials Science and Technology Überlandstrasse 129 Dübendorf CH‐8600 Switzerland
6. Department of Chemistry Biochemistry and Pharmaceutical Science University of Bern Freiestrasse 3 Bern CH‐3012 Switzerland