Affiliation: | (1) Department of Chemistry, B-040, University of California at San Diego, 92093 La Jolla, California;(2) Institute for Nonlinear Science, R-002, University of California at San Diego, 92093 La Jolla, California;(3) Division of Applied Nonlinear Problems, La Jolla Institute, 92038 La Jolla, California;(4) Present address: Departamento de Física, Universidad Autónoma Metropolitana, 13 D.F. Iztapalapa, Mexico |