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Microscopic CO Diffusion on a Pt(111) Surface by Time-Resolved Infrared Spectroscopy

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Phys. Rev. Lett., (1988)
DOI: 10.1103/PhysRevLett.61.2778

Аннотация

A new technique, combining a pulsed supersonic molecular-beam source and time-resolved surface infrared spectroscopy, has been devised to measure the microscopic diffusion of molecules at surfaces. Following a rapid dose of a periodically stepped Pt(111) crystal face to a low total coverage of CO (~0.006 monolayer), the time evolution of CO molecules migrating from terrace to step sites was monitored with a temporal resolution as fast as 5 msec. When compared with a simple kinetic model, the data reveal statistical microscopic hopping rates for CO diffusion on the (111) plane over the T=95-195 K range investigated.

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