1. Department of Molecular Science and Technology; Ajou University; Suwon 443-749 Korea
2. Department of Physics and Department of Energy Systems Research; Ajou University; Suwon 443-749 Korea
3. Institute of Computational Physics; Zurich University of Applied Sciences (ZHAW); 8401 Winterthur Switzerland
4. Department of Chemistry and Department of Energy Systems Research; Ajou University; Suwon 443-749 Korea
5. Department of Chemistry; Korea Advanced Institute of Science and Technology (KAIST); Daejeon 305-701 Korea
6. Department of Basic Science; Korea Air Force Academy; Cheongju 363-849 Korea