1. Department of Chemistry, Indiana University, Bloomington, Indiana 47405, Department of Chemistry, University of Florida, Gainesville, Florida 32611, Laboratoire Louis Néel-CNRS, BP 166, 25 Avenue des Martyrs, 38042, Grenoble, Cedex 9, France, Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093, Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, 277-8581 Chiba, Japan, and Department of Chemistry, University of...