Abstract
In this chapter I will discuss some of the surface enhanced Raman scattering (SERS) experiments with which I have been involved, focusing on one aspect of the results: the determination of the molecule-surface separation dependence of the Raman scattering enhancement of a molecule placed near a silver enhancing surface. This aspect of the SERS problem is important for both conceptual and practical reasons: conceptual, as the knowledge of the spatial range of SERS is crucial for determining its mechanisms; and practical, as one needs to know just how surface sensitive a technique it is for potential applications. We find that different silver surfaces exhibit spatial ranges of Raman enhancement which vary considerably from roughly 5 to 50 Å. How can this large variation be explained? Is this observed behavior consistent with proposed mechanisms for SERS? Can we make use of the information we have gained in the experiments for the development of a new surface spectroscopy? I believe that the different spatial ranges of Raman enhancement found for various surfaces can be explained by differences in the surface roughness features from sample to sample and are qualitatively consistent with proposed electromagnetic enhancement mechanisms.
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Murray, C.A. (1982). Molecule-Silver Separation Dependence. In: Chang, R.K., Furtak, T.E. (eds) Surface Enhanced Raman Scattering. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9257-0_11
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