1. Analog Devices, Inc., 14998 W. 6th Avenue #700, Golden, Colorado 80401, USA
2. West Pharmaceuticals Services Deutschland GmbH & Co. KG, Stolberger Strasse 21-41, 52249 Eschweiler, Germany
3. Université Libre de Bruxelles, Service de Chimie Quantique et Photophysique, 50 Ave. F. D. Roosevelt, CP 160/09, 1050 Brussels, Belgium
4. Theoretical Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
5. JILA, National Institute of Standards and Technology, University of Colorado, and Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, Colorado 80309, USA