Diffusion of potassium on Re(001) investigated by coverage grating-optical second-harmonic diffraction

W. Zhao*, R. W. Verhoef, M. Asscher

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Using the coverage grating-optical second-harmonic diffraction method, we have measured the diffusion rate of potassium on Re(001) in the coverage range of 0.6-1 ML. We observe a minimum in both the activation energy for diffusion and the diffusion preexponential at an initial potassium coverage of 0.75 ML. For potassium coverages of 0.93. 0.84. 0.73. and 0.59 ML, the activation energies for diffusion are determined to be 5.0±0.2, 3.9±0.7, 3.6±0.2, and 5.0±1.0 kcal/mol, and D0 is 5.6×10-3±0.3, 3.5×10-4±1.1, 5.8×10-4±0.3, and 3.7×10-1±1.9 cm2/s, respectively. The results are discussed in terms of electrostatic dipole-dipole repulsive interactions among neighboring adsorbates.

Original languageEnglish
Pages (from-to)5554-5560
Number of pages7
JournalJournal of Chemical Physics
Volume107
Issue number14
DOIs
StatePublished - 8 Oct 1997

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