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Laboratoire de Spectroscopie Moléculaire de Surface
Yves Caudano


Electron-phonon couplings at C60 interfaces: a case study by two-color, infrared-visible sum-frequency generation spectroscopy

Y. Caudano (1), C. Silien (1), C. Humbert (1), L. Dreesen (1), A.A. Mani (1), A. Peremans (1), and P.A. Thiry (1)
Journal of Electron Spectroscopy and Related Phenomena, 129 (2003) 139-147


We demonstrate the ability of doubly resonant sum–frequency generation (DR-SFG) to investigate electron–phonon couplings at C60–metal interfaces. Due to its coupling to electronic transitions, the totally symmetric Ag(2) vibration of C60 exhibits a huge enhancement of its nonlinear response for sum–frequency energies above the molecular electronic gap. We attribute this resonance to the coupling of the pentagonal pinch mode with the t1u lowest unoccupied molecular orbital (LUMO) 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

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Last modified, July 10th 2003

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