Adsorption of PF3 on Cu(001): Ordered overlayer structures and frustrated translational modes

J. Braun, G. G. Bishop, A. V. Ermakov, L. V. Goncharova, B. J. Hinch

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The adsorption of PF3 on Cu(001) was studied by means of high resolution helium atom scattering (HAS) and SPALEED. PF3 adsorbs at surface temperatures below 210 K and forms a lattice gas at exposures less than 0.8 L. Saturation is reached for exposures greater than 3 L. At these coverages PF3 forms an ordered c(4 x 2) layer for surface temperatures above 145 K. For temperatures below 145 K an incommensurate, hexagonal PF3 layer was observed that necessarily excludes uniquely on-top site PF3 molecule to surface coordination. A new vibrational mode in the thermal energy regime corresponding to the frustrated translation parallel to the surface was identified; the energies of excitation were 3.3 meV and 3.5 meV, respectively, for the isolated molecules and the c(4 x 2) structure. No dispersion of the frustrated translation in the ordered c(4 x 2) phase was found. The results are discussed in terms of adsorbate-adsorbate and adsorbate-substrate interactions.

Original languageEnglish (US)
Pages (from-to)5337-5345
Number of pages9
JournalJournal of Chemical Physics
Issue number11
StatePublished - Mar 15 1999


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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