1. Department
of Geological Sciences and Environmental Studies, Binghamton University, SUNY, Binghamton, New York 13902, United States
2. U.S. Geological Survey, Water Resources Division, 345 Middlefield Road, Menlo Park, California 94025, United States
3. Stanford
Synchrotron Radiation Lightsource, Menlo Park, California 94025, United States