1. Department of Physics, University of California 1 , Santa Barbara, California 93106, USA
2. McKetta Department of Chemical Engineering, University of Texas at Austin 2 , Austin, Texas 78712, USA
3. Department of Chemical Engineering, Auburn University 3 , Auburn, Alabama 36849, USA
4. Department of Chemical Engineering, University of California 4 , Santa Barbara, California 93106, USA
5. Materials Research Laboratory, University of California 5 , Santa Barbara, California 93106, USA
6. Department of Physics, University of Texas at Austin 6 , Austin, Texas 78712, USA
7. Materials Department, University of California 7 , Santa Barbara, California 93106, USA