+Getting appointed to a professorship at the University of Paderborn, it was also him, who initiated a collaboration with the local theory group under the direction of Prof. Dr. Wolf Gero Schmidt.
+I would like to thank him for six month of financial support, which allowed me to extend my research period, as well as for his helpful contributions to common articles and respective publishing procedures.
+More importantly, the collaboration involved further investigations based on first-principles calculations, which improved the quality of this work to a great extent.
+At this point, I would like to express special thanks to Dr. Eva Rauls.
+The extended version of this thesis would not have been possible without as well as her expertice in