1. FB 02 UFT − Centre for Environmental Research and Sustainable Technology, General and Theoretical Ecology, University of Bremen, Leobener Str. 6, 28359 Bremen, Germany
2. FB 02 UFT − Centre for Environmental Research and Sustainable Technology, Chemical Process Engineering, University of Bremen, Leobener Str. 6, 28359 Bremen, Germany
3. Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 6, 28359 Bremen, Germany