1. Chemistry Division, Naval Research Laboratory, 4555 Overlook Avenue, SW, Washington, D.C. 20375, Oceanography Division, Naval Research Laboratory, Building 1009, John C. Stennis Space Center, Mississippi 39529, Materials Science and Engineering Department, 130 Russ Engineering Center, Wright State University, Dayton, Ohio 45435, and Department of Physics and Engineering, Southern Oregon University, 1250 Siskiyou Boulevard, Ashland, Oregon 97520