1. Contribution from the Department of Chemistry, Texas Christian University, Fort Worth, Texas 76129, Geosciences and Environmental Technologies, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, Illinois 61801, and Dipartimento di Chimica, Università di Napoli, Via Mezzocannone 4, 80134 Naples, Italy