1. Department of Chemistry, Colorado School of Mines, 1500 Illinois Street, Golden, Colorado 80401, United States
2. Chemical and Materials Science Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
3. Department of Chemical and Biological Engineering, University of Colorado Boulder, 596 UCB, Boulder, Colorado 80309, United States
4. ESRF─The European Synchrotron, Grenoble 38000, France
5. ICGM, Univ. Montpellier, CNRS, ENSCM, Montpellier Cedex 5 34095, France