Electromagnetic effects on a molecule at a metal surface: I. Effects of nonlocality and finite molecular size |
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Authors: | G.W. Ford W.H. Weber |
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Affiliation: | Department of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA;Physics Department, Research Staff, Ford Motor Company, Dearborn, Michigan 48121, USA |
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Abstract: | The electromagnetic effects on a molecule near a metal surface are considered with the view to understanding the surface-enhanced-Raman-scattering (SERS) effect. The image enhancement effect is calculated including the nonlocal response of the metal and finite molecular size. The effect is much reduced (× 10?5) from that for a point molecule above a local metal but can still give a gain ≈ 103. The power emitted by a dipole above a smooth surface is also calculated. For an Ag surface the power emitted in the form of photons, surface plasmons, and electron-hole excitations are found to be in the ratio 1 : 3 : 106. The numerical results are calculated using the semi-classical infinite-barrier model of the metal surface with a Lindhard dielectric function modified to take into account finite electron lifetime and core polarization. |
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