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Electromagnetic aspects of the enhanced Raman scattering by a molecule adsorbed on a polarisable sphere

K Ohtaka and M Inoue

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For a molecule placed near the surface of a polarisable sphere, the exact solutions of the Maxwell equations are given for both elastic and inelastic scatterings, which refine in several ways the electrostatic results obtained so far. Based on the solutions, the criterion for the occurrence of enhanced Raman scattering is presented and the energy balance and the image dipole effect are discussed. Also, the enhancement factors are calculated for a metallic sphere of Ag, Au and Cu using experimental data of the dielectric constants and for a model dielectric sphere with a positive dielectric constant. Among other things, the possibility of the enhanced Raman scattering due to the retardation effect involved in a dielectric sphere is emphasised.


PACS

78.30.Er Solid metals and alloys

78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

Subjects

Condensed matter: electrical, magnetic and optical

Dates

Issue 31 (10 November 1982)


A Corrigendum for this article has been published in 1983 J. Phys. C: Solid State Phys. 16 3215


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