1. Schulich Faculty of Chemistry Technion – Israel Institute of Technology Haifa 32000 Israel
2. Current address of T.-A. Le: Faculty of science and engineering Åbo Akademi University Turku 20500 Finland
3. Leibniz Institute of Photonic Technology Albert-Einstein-Straße 9 07745 Jena Germany
4. Current address of Dr. A. Schleusener: Istituto Italiano di Tecnologia Via Morego 30 16163 Genova Italy
5. Institute of Physical Chemistry Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena Germany
6. Abbe Center of Photonics Albert-Einstein-Straße 6 07745 Jena Germany