1. Geoscience Australia, Symonston, ACT 2609, Cooperative Research Centre for Greenhouse Gas Technologies, Canberra, ACT 2601, and Nanoscale Science and Technology Centre, Griffith University, Brisbane, Queensland 4111, Australia
2. Australian Synchrotron, Clayton, Victoria 3168, and School of Physics, University of Melbourne, Victoria 3010, Australia
3. Indiana Geological Survey, Indiana University, Bloomington, Indiana 47405-2208
4. GeoGas Systems Pty Ltd, Wollongong, NSW 2500, Australia