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Full Description
In the course of the development of surface science, advances have been identified with the introduction of new diagnostic probes for analytical characterization of the adsorbates and microscopic structure of surfaces and interfaces. Among the most recently de veloped techniques, and one around which a storm of controversy has developed, is what has now been earmarked as surface enhanced Raman scattering (SERS). Within this phenomenon, molecules adsorbed onto metal surfaces under certain conditions exhibit an anomalously large interaction cross section for the Raman effect. This makes it possible to observe the detailed vibrational signature of the adsorbate in the ambient phase with an energy resolution much higher than that which is presently available in electron energy loss spectroscopy and when the surface is in contact with a much larger amount of material than that which can be tolerated in infrared absorption experiments. The ability to perform vibrational spectroscopy under these conditions would lead to a new understanding about the chemical identity, geome try, and bonding of adsorbed material at a level previously unacces sible. It is for these reasons that the last few years have brought an explosion of activity surrounding the exploitation of SERS. The search for the origines) of the anomalous enhancement has given rise to a research sub-activity of its own. Efforts to explain the en hancement have led to an increased understanding of the whole range of phenomena associated with the interaction of photons with adsor bates and metal surfaces.
Contents
Theory.- A Survey of Recent Theoretical Work.- The Image Field Effect: How Important Is It?.- Coupled Excitation Model and Quantum Test of Image Field Effect.- The Roles of Surface Roughness.- Electromagnetic Theory: A Spheroidal Model.- Enhanced Raman Scattering by Molecules Adsorbed at the Surface of Colloidal Particles.- A Model Including Excitation of Surface Plasmon Polaritons.- The "Adatom Model": How Important Is Atomic Scale Roughness?.- Induced Resonance Model.- Experiment.- Coverage Dependence.- Molecule-Silver Separation Dependence.- Tunnel Junction Structures.- Vibrational Spectroscopy of Molecules Adsorbed on Vapor-Deposited Metals.- Electrochemical Effects.- Organic and Inorganic Species at Ag, Cu, and Au Electrodes.- Metal Colloids.- Inelastic Mie Scattering from Rough Metal Surfaces.- Raman Scattering and Luminescence by Molecules Adsorbed at Metal Island Films.- Silver Structures Produced by Microlithography.- Nonlinear Optical Effects.- List of Contributors.
