SURFACE ENHANCED RAMAN SCATTERING: NEW CONCEPTS IN MECHANISMS AND MODELING

Abstract

The use of modeling and advanced theory has become necessary to understand SKRS as a fundamental phenomenon and to correctly interpret and predict experimental results obtained under different conditions and environments. This is valid for SM/single particle level SKRS as well as for ensembles containing few or many molecules/particles. Theoretical modeling of SKRS intensities and spectra has a long history and has been reviewed many times [8-15]. Researchers have now established that the overall enhancement factor (CF) is the electromagnetic (EM) enhancement associated with plasmon excitation in the metal particles serving as the SKRS substrate, and often during the formation of metal-molecule bonds to the metal particles and the target molecules. It has been suggested that the combination of chemical (CHEM) enhancement depends on the ability to transfer electrons in the excited state.