Abstract
Broadband-IR sum-frequency generation spectroscopy was used to investigate the CO-stretch vibration of CO chemisorbed on a Ru(001) surface at coverages as low as 0.001 monolayers (ML). Due to the high intensity of the broadband-IR pulses the v=1→2 hot band of the CO-stretch vibration of CO on pure and oxygen-covered Ruthenium is observed for the first time. The simultaneous detection of the fundamental and hot-band transition allows the determination of the anharmonicity constant x e ω e directly. For a coverage of 0.004 ML one obtains 13.6 cm −1 for 12 C 16 O and 14.5 cm −1 for 12 C 16 O co-adsorbed with O.
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