1. Process Analysis and Technology (PA&T), Reutlingen University, Alteburgstr. 150, D-72762 Reutlingen, Germany
2. Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
3. Gigahertz Optik GmbH, An der Kälberweide 12, D-82299 Türkenfeld, Germany