[1] Philips Res Labs, FOM, Inst Atom & Mol Phys, NL-5656 AE Eindhoven, Netherlands
[2] Mat Innovat Inst M2i, NL-2628 CD Delft, Netherlands
[3] Radboud Univ Nijmegen, Inst Mol & Mat, Dept Solid State Chem, NL-6525 ED Nijmegen, Netherlands
[4] FOM, Inst Atom & Mol Phys, NL-1098 SJ Amsterdam, Netherlands
[5] Philips Res Europe, Miplaza Technol Labs, NL-5656 AE Eindhoven, Netherlands
[6] Univ Twente, MESA, Inst Nanotechnol, NL-7500 AE Enschede, Netherlands