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Competition between electron and phonon excitations in the scattering of nitrogen atoms and molecules off tungsten and silver metal surfaces

AuthorsMartin-Gondre, L.; Alducin Ochoa, Maite ; Bocan, Gisela A.; Díez Muiño, Ricardo ; Juaristi Oliden, Joseba Iñaki
Issue DateMar-2012
PublisherAmerican Physical Society
CitationPhysical Review Letters 108(9): 096101 (2012)
AbstractWe investigate the role played by electron-hole pair and phonon excitations in the interaction of reactive gas molecules and atoms with metal surfaces. We present a theoretical framework that allows us to evaluate within a full-dimensional dynamics the combined contribution of both excitation mechanisms while the gas particle-surface interaction is described by an ab initio potential energy surface. The model is applied to study energy dissipation in the scattering of N2 on W(110) and N on Ag(111). Our results show that phonon excitation is the dominant energy loss channel, whereas electron-hole pair excitations represent a minor contribution. We substantiate that, even when the energy dissipated is quantitatively significant, important aspects of the scattering dynamics are well captured by the adiabatic approximation.
Description4 páginas, 3 figuras.-- PACS numbers: 82.65.+r, 34.35.+a, 68.49.Df, 82.20.Kh
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.108.096101
Appears in Collections:(CFM) Artículos
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