1. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
2. Department of Mathematics and Physics Teaching Methods, Far-Eastern Federal University, Vladivostok 690090, Russia
3. Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
4. Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1211, USA
5. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
6. Illinois State Geological Survey, Prairie Research Institute, University of Illinois at Urbana-Champaign, Champaign, Illinois 61820, USA