1. Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, F. Skaryna Ave., 70, Minsk 220072, Belarus, Laboratory of Molecular Physics, Department of Biomolecular Sciences, Agricultural University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands, A.V. Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine, Lustdorfskaya doroga, 86, Odessa 270080, Ukraine, and Department of Chemistry, Washington University, St. Louis, Missouri 63130