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- W1971877891 endingPage "3545" @default.
- W1971877891 startingPage "3524" @default.
- W1971877891 abstract "Angular distributions and surface-phonon dispersion curves have been measured by He-atom scattering for clean Pt between T=160 and 373 K and for Pt-H(1ifmmodetimeselsetexttimesfi{}1) at 160 K along the 〈110〉 and 〈112〉 azimuths. Inelastic-scattering intensities over a wide range of wave vectors are also reported for the clean surface. The results are analyzed with use of the distorted-wave Born approximation for a model potential describing the He-atom--Pt-surface potential. A set of 14 force constants adjusted to the bulk-phonon dispersion data cannot explain the measured time-of-flight spectra and the observed first-layer relaxation. However, by modifying at the surface the nearest-neighbor tangential force constants (${ensuremath{alpha}}_{1}^{mathcal{'}mathcal{'}}$=1.7${ensuremath{alpha}}_{1}^{b}$, and ${ensuremath{alpha}}_{1}^{mathcal{'}}$=1.3${ensuremath{alpha}}_{1}^{b}$), the radial force constants (${ensuremath{beta}}_{1}^{mathcal{'}mathcal{'}}$=0.39${ensuremath{beta}}_{1}^{b}$), and the three-body force constant (${ensuremath{gamma}}_{1}^{mathcal{'}mathcal{'}}$=0.037${ensuremath{gamma}}_{1}^{b}$)--- where the superscripts ensuremath{parallel} and ensuremath{perp} denote forces within the surface plane and between the first and second planes, respectively---a good fit to all the data is achieved. The new surface force constants are discussed in terms of electronic-charge redistribution within the first layer." @default.
- W1971877891 created "2016-06-24" @default.
- W1971877891 creator A5006798753 @default.
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- W1971877891 date "1989-08-15" @default.
- W1971877891 modified "2023-10-16" @default.
- W1971877891 title "Surface phonons on the Pt(111) surface: A comparison of He-scattering experiments with lattice-dynamical calculations" @default.
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- W1971877891 doi "https://doi.org/10.1103/physrevb.40.3524" @default.
- W1971877891 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9992321" @default.
- W1971877891 hasPublicationYear "1989" @default.
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