1. Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland
2. Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland
3. Ferrovac GmbH, Thurgauerstrasse 72, 8050 Zürich, Switzerland
4. Department of Chemistry, Universität Zürich, CH-8057 Zürich, Switzerland
5. Institute for Chemical and Bioengineering, ETH Zurich, CH-8093 Zürich, Switzerland