[1] Univ Munich, Dept Chem, Munich Ctr Integrated Prot Sci CiPSM, D-81377 Munich, Germany
[2] Univ Munich, Ctr Nanosci, D-81377 Munich, Germany
[3] Univ Dusseldorf, Inst Phys Chem 2, D-40225 Dusseldorf, Germany
[4] LMU Munchen, Inst Physiol Chem, D-81377 Munich, Germany
[5] Univ Illinois, Dept Phys, Urbana, IL 61801 USA