1. C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506, United States
2. Department of Mathematics and Natural Sciences, University of Wisconsin—Milwaukee, West Bend, Wisconsin 53095, United States
3. Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551, United States
4. IPR (Institut de Physique de Rennes), UMR 6251, Univ Rennes, CNRS, F-35000 Rennes, France