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

Andre Peremans; Y. Caudano; Paul Dumas; Wan Quan Zheng; A. Le Rille; Paul A. Thiry; Abderrahmane Tadjeddine

doi:10.1117/12.307139

30 April 1998 Sum-frequency generation spectroscopy in the mid-infrared: K-doped C₆₀/Ag (111) interface

Andre Peremans, Y. Caudano, Paul Dumas, Wan Quan Zheng, A. Le Rille, Paul A. Thiry, Abderrahmane Tadjeddine

Proceedings Volume 3272, Laser Techniques for Surface Science III; (1998) https://doi.org/10.1117/12.307139
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

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 micrometers ) 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 A_g(2) mode (approximately 1445 cm^-1) and its softening are quenched upon K-doping. This allows us to infer the coupling strength of the A_g(2) vibration to the t_1u orbital of C₆₀.

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Andre Peremans, Y. Caudano, Paul Dumas, Wan Quan Zheng, A. Le Rille, Paul A. Thiry, and Abderrahmane Tadjeddine "Sum-frequency generation spectroscopy in the mid-infrared: K-doped C₆₀/Ag (111) interface", Proc. SPIE 3272, Laser Techniques for Surface Science III, (30 April 1998); https://doi.org/10.1117/12.307139

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