Dynamics of Pt adatoms and dimers on Pt(110)-(1×2) observed directly by STM

T.R. Linderoth, Sebastian Horch, Erik Lægsgaard, I. Stensgaard, F. Besenbacher

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Abstract

The one-dimensional diffusion of Pt adatoms as well as the formation/dissociation kinetics of Pt dimers in the missing row troughs of the (1 x 2) reconstructed Pt(110) surface is monitored directly from atomically resolved time-lapsed STM images. For this self-diffusion system, it is found surprisingly that not only jumps between nearest neighbour sites but also long jumps, i.e. jumps between next nearest neighbour sites participate. The hopping rate for these long jumps is found to follow an Arrhenius dependence on temperature with an activation barrier for diffusion E-d2 = 0.89 eV slightly larger than that for single jumps E-d1 = 0.81 eV. It is found that dimers dissociate with a rate only slightly below that for single atom diffusion. Using the data obtained for the latter, the formation/dissociation kinetics of Pt dimers in the missing row troughs can be analysed and the binding energy of the Pt dimer is determined to be E-b = 0.07 eV. (C) 1998 Elsevier Science B.V. All rights reserved.
Original languageEnglish
JournalSurface Science
Volume402
Issue number1-3
Pages (from-to)308-312
ISSN0039-6028
DOIs
Publication statusPublished - 1998
Externally publishedYes
Event17th European Conference on Surface Science - Enschede, Netherlands
Duration: 16 Sep 199719 Sep 1997
Conference number: 17

Conference

Conference17th European Conference on Surface Science
Number17
Country/TerritoryNetherlands
CityEnschede
Period16/09/199719/09/1997

Keywords

  • Growth
  • Nucleation
  • Platinum
  • Scanning tunneling microscopy
  • Surface diffusion

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