Li, X. [P:(DE-Juel1)6775] ; Brauers, T. [P:(DE-Juel1)16306] ; Shao, M. [P:(DE-HGF)0] ; Garland, R.M. [P:(DE-HGF)0] ; Wagner, T. [P:(DE-HGF)0] ; Deutschmann, T. [P:(DE-HGF)0] ; Wahner, A. [P:(DE-Juel1)16324]