1. Institute of Experimental and Applied Physics, Czech Technical University, 110 00 Prague, Czech Republic
2. Faculty of Mechanical Engineering, Slovak University of Technology in Bratislava, 812 31 Bratislava, Slovakia
3. Department of Theoretical Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
4. Laboratory of Physical Chemistry, Department of Chemistry, National and Kapodistrian, University of Athens, 15772 Athens, Greece
5. Cyclotron Institute, Texas A&M University, College Station, TX 77840, USA
6. Laboratori Nazionali del Sud, INFN, 95125 Catania, Italy
7. Department of Physics and Mathematics, University of Zaragoza, 50009 Zaragoza, Spain