A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Abstract Raman spectroscopy has become a powerful tool for investigating the structures and reactions of molecules adsorbed on surfaces. As recently as a few years ago, it was generally thought that the Raman technique would not offer sufficient sensitivity to examine adsorption at low coverages on low-surface- area materials; two developments have radically altered that view, however. The important discovery of surface-enhanced Raman spectroscopy (SERS) and the application of multichannel optical techniques for unenhanced surface Raman spectroscopy have increased the effective sensitivity of the method so that it is now possible to study adsorbates at coverages on the order of 1 % of a monolayer. In SERS, the scattered intensities can be more than a million times larger than expected from gas-phase Raman scattering cross sections and the density of adsorbed molecules. The origin of this enormous effect has stimulated a great deal of research activity over the past few years, and the general features of the mechanisms involved are reasonably well understood. The increased intensity of SERS makes it possible to study adsorption and surface chemical processes at low coverages and even make time-resolved measurments using conventional Raman instrumentation. In addition, the surface selectivity of the technique ensures that the processes under observation originate on or very close to the surface.
Abstract Raman spectroscopy has become a powerful tool for investigating the structures and reactions of molecules adsorbed on surfaces. As recently as a few years ago, it was generally thought that the Raman technique would not offer sufficient sensitivity to examine adsorption at low coverages on low-surface- area materials; two developments have radically altered that view, however. The important discovery of surface-enhanced Raman spectroscopy (SERS) and the application of multichannel optical techniques for unenhanced surface Raman spectroscopy have increased the effective sensitivity of the method so that it is now possible to study adsorbates at coverages on the order of 1 % of a monolayer. In SERS, the scattered intensities can be more than a million times larger than expected from gas-phase Raman scattering cross sections and the density of adsorbed molecules. The origin of this enormous effect has stimulated a great deal of research activity over the past few years, and the general features of the mechanisms involved are reasonably well understood. The increased intensity of SERS makes it possible to study adsorption and surface chemical processes at low coverages and even make time-resolved measurments using conventional Raman instrumentation. In addition, the surface selectivity of the technique ensures that the processes under observation originate on or very close to the surface.
Raman Spectroscopy of Adsorbed Molecules
Campion, A. (author)
1986-01-01
23 pages
Article/Chapter (Book)
Electronic Resource
English
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