[1] Friedrich Alexander Univ Erlangen Nurnberg FAU, Dept Chem & Pharm, Nikolaus Fiebiger Str 10, D-91058 Erlangen, Germany
[2] Friedrich Alexander Univ Erlangen Nurnberg FAU, Dept Phys, Staudtstr 7, D-91058 Erlangen, Germany
[3] Univ Bundeswehr, Fac Elect Engn & Informat Technol, Inst Phys, EIT 2, D-85579 Neubiberg, Germany