1. Faculty
of Chemistry, Adam Mickiewicz University in Poznań, Umultowska
89b, 61-614 Poznań, Poland
2. Laboratory
of Theoretical Physics, Department of Physics, University of Puerto Rico, San
Juan, Puerto Rico 00931-3343
3. Department
of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602-5700, United States