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

J. E. Reutt-Robey; D. J. Doren; Y. J. Chabal; S. B. Christman

doi:10.1103/PhysRevLett.61.2778

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

J. E. Reutt-Robey, D. J. Doren, Y. J. Chabal, and S. B. Christman

Phys. Rev. Lett. 61, 2778 – Published 12 December 1988

Abstract

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.

Received 26 September 1988

DOI:https://doi.org/10.1103/PhysRevLett.61.2778

Authors & Affiliations

J. E. Reutt-Robey^*, D. J. Doren^†, Y. J. Chabal, and S. B. Christman

AT&T Bell Laboratories, Murray Hill, New Jersey 07974

^*Present address: Department of Chemistry, University of Maryland, College Park, MD 20742.
^†Present address: Chemistry Department, University of Delaware, Newark, DE 19716.