Sum-frequency generation spectroscopy in the mid-infrared: K-doped C60/Ag(111) interface

André Peremans, Yves Caudano, Paul Dumas, Wan Quan Zheng, Alain Le Rille, Paul Thiry, Abderrahmane Tadjeddine

Research output: Contribution to journalArticle

Abstract

We have developed a Sum-Frequency Generation (SFG) spectrometer allowing sensitive and highly resolved (1.8 cm-1) vibrational spectroscopy in the mid-infrared (2-10 µm) using a dedicated picosecond optical parametric oscillator. Combining SFG and infrared absorption-reflection spectroscopy, we pinpoint the occurrence of dynamical charge transfer at the C60/Ag(111) interface. The induced strong infrared activation of the C60 Ag(2) mode (~1440 cm-1) and its softening are quenched upon K-doping. This allows us to infer the coupling strength of the Ag(2) vibration to the t1u orbital of C60.
Original languageEnglish
Pages (from-to)35-41
Number of pages7
JournalProceedings of SPIE
Volume3272
Publication statusPublished - 1998

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