1. INVITE GmbH, 51368 Leverkusen, Germany
2. Chair of Solids Process Engineering, TU Dortmund University, 44227 Dortmund, Germany
3. Department of Physics, TU Dortmund University, 44221 Dortmund, Germany
4. Bayer AG, 40789 Monheim, Germany
5. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA