1. Hefei National Laboratory for Physical Sciences at Microscale
2. Department of Chemical Physics
3. University of Science and Technology of China
4. Hefei
5. P. R. China 230026
6. Faculty of Materials Science and Engineering
7. South China University of Technology
8. Guangzhou
9. P. R. China 510640
10. Theoretical and Physical Chemistry Institute
11. National Hellenic Research Foundation
12. Athens 11635
13. Greece