Ordering of Self-Diffusion Barrier Energies on Pt(110)-1x2 Page: 1 of 18
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For Physical Review B, Rapid Comunications
Ordering of self-diffusion barrier energies on Pt(110)-1x2
Peter J. Feibelman
Sandia National Laboratories'
Albuquerque, NM 87185-1413 JUN y 1999
Bond-counting arguments, supported by ab-initio calculations, predict a lower
barrier for "leapfrog" diffusion of Pt addimers on Pt(110)-1x2 than for adatom dif-
fusion or addimer dissociation. This conflicts with experiment, possibly signalling
Controlling the time-evolution of surface morphology requires understanding
how surface species migrate. High-resolution microscopy provides snapshots of dif-
fusion paths, but hard-to-capture details can make their interpretation a challenge.
This is important because the mechanisms that dominate matter-transport on a sur-
face need not be "obvious" ones. One might guess, e.g., that self-diffusion on
"missing row" Pt(110)-1x2 would be one-dimensional, but the minimum-energy
path (MEP) for a diffusing Pt adatom need not be parallel to a channel. It might
instead lead to the top of a wall and along it before returning to the channel bottom,
as in Fig. 1.1
Adatom displacement from channel bottom to top is known to permit facile
migration of Pt-adclusters on Pt(110)-1x2. Notwithstanding the frequent assump-
tion that only isolated adatoms displace at low T, Linderoth, et al. find that even tri-
mers and tetramers migrate on this surface at 300-350K.2 They show that the Pt at
the end of a cluster moves up to a site between the rest of the cluster and the channel
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Feibelman, Peter J. Ordering of Self-Diffusion Barrier Energies on Pt(110)-1x2, article, June 1, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc707263/m1/1/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.