1. John
A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
2. Department
of Engineering, University of Rome “Roma Tre”, 00141 Rome, Italy
3. Technische Universität München,
Chemistry Department, Lichtenbergstraße 4, D-85748 Garching b. München, Germany
4. Istituto
per le Applicazioni del Calcolo, CNR, 00185 Rome, Italy