1. Materials and Process Simulation Center, Beckman Institute (139-74), Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125
2. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125
3. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125 Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125