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Direct Observation of Surface Chemistry Using Ultrafast Soft-X-Ray Pulses

2001; American Physical Society; Volume: 87; Issue: 2 Linguagem: Inglês

10.1103/physrevlett.87.025501

1092-0145

Michael Bauer, Chenglong Lei, K. Read, R. Tobey, John L. Gland, Margaret M. Murnane, Henry C. Kapteyn,

Advanced X-ray Imaging Techniques

We present the first demonstration of the use of ultrafast extreme-ultraviolet pulses to directly monitor a surface chemical reaction on femtosecond time scales. By adsorbing molecular oxygen onto a platinum surface and exciting it with an ultrafast laser pulse, changes in the oxygen-platinum chemical bond on a subpicosecond time scale were observed through changes in the photoelectron spectra. This work demonstrates a powerful new technique for studying reactions of interest in catalysis and for probing changes of local order on surfaces on their fundamental time scales.