1. Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
2. Synchrotron Radiation Research, Lund University, Box 118, SE-221 00 Lund, Sweden
3. Institute of Experimental and Applied Physics, Kiel University, D-24098 Kiel, Germany
4. Division of Combustion Physics, Lund University, SE-221 00 Lund, Sweden
5. Experimental Division, ESRF, 71 Avenue des Martyrs, F-38000 Grenoble, France
6. Materials Science and Applied Mathematics, Malmö University, SE-204 06 Malmö, Sweden