1. S. R. Marder, Beckman Institute, California Institute of Technology, Pasadena, CA 91125, USA, and Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
2. W. E. Torruellas, V. Ricci, G. I. Stegeman, Center for Research on Education, Optics, and Lasers, University of Central Florida, 4000 Central Florida Boulevard, Orlando, FL 32816, USA.
3. M. Blanchard-Desce, Ecole Normale Supérieure, Département de Chimie (Unité de Recherche Associée 1679 CNRS), 24 rue Lhomond 75231, Paris Cedex 05, France.
4. S. Gilmour, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
5. J.-L. Brédas and J. Li, Center for Research on Molecular Electronics and Photonics, Université de Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium.