1. Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA and School of Engineering and Applied Science, Harvard University, Cambridge, Massachusetts 02138, USA
2. Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, Dunkerque, France
3. Coker College, Hartsville, South Carolina 29550, USA
4. I. Physikalisches Institut, Universität zu Köln, Köln, Germany
5. AILES Beamline, Synchrotron SOLEIL, Saint Aubin, France