Physics – Condensed Matter – Materials Science
Scientific paper
2009-09-30
Phys. Rev. Lett. 88, 166802 (2002)
Physics
Condensed Matter
Materials Science
4 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.88.166802
A method is presented for calculating electron-hole pair excitation due to an incident atom or molecule interacting with a metal surface. Energy loss is described using an \textit{ab initio} approach that obtains a position-dependent friction coefficient for an adsorbate moving near a metal surface from a total energy pseudopotential calculation. A semi-classical forced oscillator model is constructed, using the same friction coefficient description of the energy loss, to describe excitation of the electron gas due to the incident molecule. This approach is applied to H and D atoms incident on a Cu(111) surface, and we obtain theoretical estimates of the `chemicurrents' measured by Nienhaus et al [Phys. Rev. Lett. \textbf{82}, 446 (1999)] for these atoms incident on the surface of a Schottky diode.
Bird D. M.
Graham Chris M.
Holloway S.
Persson Mats
Trail John Robert
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