1. Division
of Materials Science, University of California at Davis, Davis, California 95616, United States
2. Center
of Interdisciplinary Magnetic Resonance, National High Field Magnetic Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
3. Department
of Chemistry, University of California at Davis, Davis, California 95616, United States
4. Glass
Research Division, SP-FR-05-1, Corning Incorporated, Corning, New York 14831, United States