1. Department
of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
2. Department
of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K.
3. Faculty
of Applied Physics and Mathematics, Gdańsk University of Technology, Gdańsk 80-233, Poland
4. Molecular Sciences Software Institute, Virginia Tech, Blacksburg, Virginia 24060, United States