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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