title: Diffusion and pair interactions of CO molecules on Pd(111).
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 sqrt[3].
authors.affiliation: Materials Sciences Division, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: T
authors.initials: T
authors.lastname: Mitsui
authors.forename: M K
authors.initials: MK
authors.lastname: Rose
authors.forename: E
authors.initials: E
authors.lastname: Fomin
authors.forename: D F
authors.initials: DF
authors.lastname: Ogletree
authors.forename: M
authors.initials: M
authors.lastname: Salmeron