1. J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of Czech Republic, v.v.i. Dolejškova 3, 182 23 Prague 8, Czech Republic
2. L.V. Pisarzhevskiy Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31 pr. Nauky, Kyiv 03028, Ukraine
3. Eni S.p.A., Refining & Marketing Division, San Donato Milanese Research Center, Physical Chemistry Dept., via F. Maritano 26, I-20097 San Donato Milanese, Italy