1. Materials and Nano Physics, School of Engineering Sciences, KTH Royal Institute of Technology, SE-11419 Stockholm, Sweden
2. Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
3. Department of Chemical Engineering, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
4. Photon Science Division, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland