Diffusion and pair interactions of CO molecules on Pd(111) |
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Authors: | Mitsui T Rose M K Fomin E Ogletree D F Salmeron M |
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Institution: | Materials Sciences Division, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. |
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Abstract: | The diffusion and interactions of CO molecules on Pd(111) were studied by scanning tunneling microscopy. By following the random walk motion of individual molecules as a function of temperature, an activation energy barrier for diffusion of 118 +/- 5 meV was determined. The interaction between CO molecules was found to be repulsive for pairs separated by one or two Pd(111) lattice distances, and weakly attractive at a separation of sqrt3]. |
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