1. Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
2. Haldor Topsøe A/S, DK-2800 Kgs. Lyngby, Denmark
3. Department of Chemistry, Copenhagen University, DK-2100 Copenhagen, Denmark
4. Department of Health Technology, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
5. Danish Technological Institute, Gregersensvej 1, DK-2630 Taastrup, Denmark