Single-molecule pump-probe detection resolves ultrafast pathways in individual and coupled quantum systems
van Dijk, Erik M. H. P. (Institute for Nanotechnology (Enschede, Països Baixos))
Hernando Campos, Jordi (Institute for Nanotechnology (Enschede, Països Baixos))
García López, Juan José (Institute for Nanotechnology (Enschede, Països Baixos))
Crego Calama, Mercedes (Institute for Nanotechnology (Enschede, Països Baixos))
Reinhoudt, David N. (Institute for Nanotechnology (Enschede, Països Baixos))
Kuipers, Laurens (Institute for Nanotechnology (Enschede, Països Baixos))
García Parajó, María F.. (Institute for Nanotechnology (Enschede, Països Baixos))
van Hulst, Niek F.. (Institute for Nanotechnology (Enschede, Països Baixos))

Data:	2005
Resum:	We report the first experimental study of individual molecules with femtosecond time resolution using a novel ultrafast single-molecule pump-probe method. A wide range of relaxation times from below 100 up to 400 fs is found, revealing energy redistribution over different vibrational modes and phonon coupling to the nanoenvironment. Addressing quantum-coupled molecules we find longer decay times, pointing towards inhibited intramolecular decay due to delocalized excitation. Interestingly, each individual system shows discrete jumps in femtosecond response, reflecting sudden breakup of the coupled superradiant state.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; Versió publicada
Publicat a:	Physical review letters, Vol. 94, Issue 7 (February 2005) , p. 78302, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.94.078302

4 p, 134.6 KB

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