1. Department of Chemical and Materials Engineering, Arizona State University, Tempe, Arizona 85287, Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, Institute for Biological Information Processing, Forschungszentrum Jülich, D-52425 Jülich, Germany, and Applied Laserphysics and Laserspectroscopy, University of Bielefeld, 33615 Bielefeld, Germany