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- W2017410012 abstract "High resolution time-of-flight spectra of helium atoms scattered from single crystal surfaces provide detailed information on surface phonon dispersion curves. For metal surfaces a number of different modes have been observed by both helium atom scattering (HAS) and by electron scattering (EELS). For many metals for which several modes have been detected simple Born–von Karman force constant models, although successful in describing the bulk phonon dispersion curves, are not able to fit all the available surface data. Recently it has been demonstrated that a new lattice dynamical model, which accounts for electron-phonon coupling by the introduction of pseudocharges to accommodate the electronic dynamical degrees of freedom is however able to explain all the observations for several important prototype systems. These include Cu(001) and Cu(111), the soft mode seen in W(001), and also all the modes, including optical modes in 1T3-TaS2. This new model explains the anomalously large intensities of longitudinal surface phonon resonances only observed in helium scattering on Cu(001) and Cu(111) by accounting for the direct interaction of the He atoms with electron charge density deformations modeled by pseudocharges." @default.
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- W2017410012 date "1993-01-01" @default.
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- W2017410012 title "Electron-phonon coupling at metal surfaces probed by helium atom scattering" @default.
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