1. Department
of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States
2. Departament
de Fisicoquímica, Facultat de Farmàcia, Universitat de Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain
3. Dipartimento
di Chimica e Chimica Industriale, University of Pisa, via G. Moruzzi
3, 56124 Pisa, Italy
4. Gaussian, Inc., 340 Quinnipiac
Street, Building 40, Wallingford, Connecticut 06492, United States