1. Department of Physics, University of Konstanz, 78457 Konstanz, Germany
2. Department of Chemistry, Columbia University, New York, New York 10027, United States
3. Singapore Institute of Manufacturing Technology, 2 Fusionopolis Way, Singapore 138634, Singapore
4. Department of Chemistry, Queensborough Community College of the City University of New York, Bayside, New York 11364, United States
5. Institut für Anorganische und Angewandte Chemie, The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany