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Laboratoire de Spectroscopie Moléculaire de Surface
Yves Caudano


Electronic tuning of dynamical charge transfer at an interface: K-doping of C60/Ag(111)

A. Peremans (1), Y. Caudano (1), P.A.Thiry (1), P. Dumas (2, 3), W.-Q. Zheng (2), A. Le Rille (2) and A. Tadjeddine (2)
Phys. Rev. Lett 78 (1997) 2999-3002


High-resolution vibrational spectroscopy of fullerene thin films is achieved by sum-frequency generation and infrared absorption. The Ag(2) mode of C60 gains strong infrared activity when the molecule is adsorbed on Ag(111). K-doping allows to demonstrate the process of adsorbate/substrate dynamical charge transfer, by showing, for the first time, the quenching of the mode softening and infrared activity upon tuning of the admolecule electronic properties. These observations enable the quantitative evaluation of the coupling strength of the Ag(2) vibration to the t1u orbital of C60.

Author addresses

  1. Laboratoire de Spectroscopie Moléculaire de Surface (LASMOS)
    Institute for Studies in Interface Science (ISIS)
    Facultés Universitaires Notre-Dame de la Paix (FUNDP)
    61 Rue de Bruxelles, B-5000 Namur, Belgium

  2. Laboratoire pour l'Utilisation du Rayonnement Electromagnétique (LURE)
    Centre National de la Recherche Scientifique (CNRS)
    Bâtiment 209D, F-91405 Orsay, France

  3. Also LASIR-CNRS, 2 rue Henry Dunant, F-94320 Thiais, France

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