1. Ecole Polytechnique Fédérale de Lausanne; Laboratory for Photomolecular Science; Institute of Chemical Sciences and Engineering, Station 6; Lausanne 1015 Switzerland
2. Uppsala University, Physical Chemistry; Ångström Laboratory; Box 523 Uppsala 75120 Sweden
3. Chemical Informatics Research Group; Chemical Science Division, Material Measurement Laboratory; National Institute of Standards and Technology; 100 Bureau Drive, Stop 8320 Gaithersburg Maryland 20899-8320 USA
4. Dyenamo AB; Teknikringen 38 A 11428 Stockholm Sweden