[1] Helmholtz Inst Jena, Frobelstieg 3, D-07743 Jena, Germany
[2] GSI Helmholtzzentrum Schwerionenforschung, Planckstr 1, D-64291 Darmstadt, Germany
[3] Friedrich Schiller Univ Jena, Abbe Ctr Photon, Theoret Phys Inst, Max Wien Pl 1, D-07743 Jena, Germany
[4] Friedrich Schiller Univ Jena, Inst Angew Phys, Max Wien Pl 1, D-07743 Jena, Germany
[5] Univ Rostock, Inst Phys, Albert Einstein Str 23, D-18059 Rostock, Germany
[6] Univ Rostock, Dept Life Light & Matter, Albert Einstein Str 25, D-18059 Rostock, Germany