Oxygen island formation on Pt(111) studied by dynamic Monte Carlo simulation

Masanari Nagasaka, Hiroshi Kondoh, Ikuyo Nakai, Toshiaki Ohta

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The formation of oxygen islands on the Pt(111) surface has been studied as a function of temperature by low energy electron diffraction (LEED) experiments and dynamic Monte Carlo (DMC) simulations. By raising the temperature, the (2×2) LEED spot intensity increases gradually and decays after a peak at around 255 K (T p) with full width of half maximum of 160 K. This behavior is interpreted by DMC simulations with the kinematical LEED analysis. In the DMC simulation, an oxygen atom hops to the neighboring site via the activation barrier of the saddle point. The potential energies at initial, saddle, and final points are changed at each hopping event depending on the surrounding oxygen atoms. By comparing the observed T p with the simulated one, the interaction energy E of oxygen atoms on Pt(111) was determined to be 25±3meV at 2a 0. The DMC simulations visualize how the oxygen islands are formed and collapse on Pt(111) with increase of the temperature and well reproduce the surface configurations observed by scanning tunneling microscopy.

Original languageEnglish
Article number044715
JournalJournal of Chemical Physics
Volume122
Issue number4
DOIs
Publication statusPublished - 2005
Externally publishedYes

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Low energy electron diffraction
Oxygen
oxygen atoms
electron diffraction
oxygen
saddle points
simulation
Atoms
energy
temperature
scanning tunneling microscopy
Scanning tunneling microscopy
Potential energy
potential energy
Temperature
activation
Chemical activation
Monte Carlo simulation
decay
configurations

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Oxygen island formation on Pt(111) studied by dynamic Monte Carlo simulation. / Nagasaka, Masanari; Kondoh, Hiroshi; Nakai, Ikuyo; Ohta, Toshiaki.

In: Journal of Chemical Physics, Vol. 122, No. 4, 044715, 2005.

Research output: Contribution to journalArticle

Nagasaka, Masanari ; Kondoh, Hiroshi ; Nakai, Ikuyo ; Ohta, Toshiaki. / Oxygen island formation on Pt(111) studied by dynamic Monte Carlo simulation. In: Journal of Chemical Physics. 2005 ; Vol. 122, No. 4.
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