Quantitative SNIFTIRS and PM IRRAS of Organic Molecules at Electrode Surfaces

Quantitative SNIFTIRS and PM IRRAS of Organic Molecules at Electrode Surfaces 

The object of this chapter is to describe recent methodological developments in SNIFTIRS and PM IRRAS that have made these techniques powerful quantitative tools to measure tilt angles of molecules in thin organic films adsorbed at metal electrode surfaces. This chapter complements a general description of recent advances in IR spectroscopy in Chapter 7 and a review of SEIRAS in Chapter 8. 

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H6 I 9 Quantitative SNIFTIRS and PM IRRAS of Organic Molecules at Electrode Surfaces Cap2 prism window... 

The quantitative SNIFTIRS and PM IRRAS were developed three years ago. They allow one to measure the angle between the direction of the transition dipole of an IR band and the normal to the electrode surface. Since the direction of the transition dipole with respect to the coordinates of the adsorbed molecule could be determined with the help of ah initio normal coordinate calculations, these methods ultimately allow one to determine the orientation of molecules adsorbed at the electrode surface. In a short period of time, they have been successfully applied to provide information concerning the orientation of molecules in several organic films. Today, thanks to the availability of these methods, investigations of thin films at the metal/solution interface may be as detailed as they were at the metal/gas or metal/vacuum interfaces in the past... 

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