Surface-enhanced Raman scattering in a two-oscillator electromagnetic model

Agarwal, G. S. ; Jha, Sudhanshu S. (1982) Surface-enhanced Raman scattering in a two-oscillator electromagnetic model Physical Review B, 26 (8). pp. 4013-4021. ISSN 0163-1829

PDF - Publisher Version

Official URL:

Related URL:


A two-oscillator model is considered to investigate the effect of a metal substrate of dielectric function ε(ω) on the Raman scattering from a molecule absorbed on the metal surface. In the presence of the metal and an external electric field, the linear motion of the electronic and ionic oscillators in the molecule get coupled, in general. For obtaining Raman scattering at the Stokes frequency, a phenomenological nonlinear force term, which is bilinear in the oscillator amplitudes, is introduced in the equation of motion. The whole problem is considerably simplified when we use the fact that the ionic mass is much larger than the electronic mass and the ionic vibration frequency is much smaller than the electronic and optical frequencies. It is shown that because of different renormalization factors the frequency dependence of the enhancement factor F, taken to be the ratio of Raman intensity with and without the metal, is quite different from that calculated by using the familiar polarizability-derivative theory. Applying the well-known fluctuation-dissipation theorem, the new Raman line shape is also calculated to contrast it with the corresponding line shape in the absence of the metal.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:13916
Deposited On:12 Nov 2010 14:29
Last Modified:16 May 2016 22:59

Repository Staff Only: item control page