期刊
SCIENCE
卷 310, 期 5755, 页码 1790-1793出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1120693
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The laser-induced movement of CO molecules over a platinum surface was followed in real time by means of ultrafast vibrational spectroscopy. Because the CO molecules bound on different surface sites exhibit different C-O stretch vibrational frequencies, the site-to-site hopping, triggered by excitation with a laser pulse, can be determined from subpicosecond changes in the vibrational spectra. The unexpectedly fast motion-characterized by a 500-femtosecond time constant-reveals that a rotational motion of the CO molecules, rather than pure translation, is required for this diffusion process. This conclusion is corroborated by density functional theory calculations.
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