1. Department of Physics, University of Patras, Patras 26504, Greece
2. Institute of Chemical Engineering Sciences, Foundation of Research and Technology-Hellas (FORTH/ICE-HT), Stadiou Street, Platani, Patras 26504 Greece
3. Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece
4. University Research Center of Ioannina (URCI), Institute of Materials Science and Computing, University of Ioannina, Ioannina 45110, Greece
5. Laboratory of Quantum and Computational Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
6. School of Physics, Department of Solid State Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece