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

Yves Caudano, Christophe Silien, Christophe Humbert, Laurent Dreesen, Alaa Addin Mani, André Peremans, Paul Thiry

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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.
langue originaleAnglais
Pages (de - à)139-147
Nombre de pages9
journalJournal of Electron Spectroscopy and Related Phenomena
Numéro de publication2-3
étatPublié - 2003

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