  We present a general model study of surface-enhanced resonant Raman
scattering and fluorescence focusing on the interplay between electromagnetic
effects and the molecular dynamics. Our model molecule is placed close to two
Ag nanoparticles, and has two electronic levels. A Franck-Condon mechanism
provides electron-vibration coupling. Using realistic parameter values for the
molecule we find that an electromagnetic enhancement by 10 orders of magnitude
can yield Raman cross-sections $\sigma_{R}$ of the order $10^{-14}
\unit{cm^2}$. We also discuss the dependence of $\sigma_{R}$ on incident laser
intensity.
