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Published in:
2017 | OriginalPaper | Chapter
3. Surface Spectroscopy Using FT-IR
Author : Takeshi Hasegawa
Published in: Quantitative Infrared Spectroscopy for Understanding of a Condensed Matter
Publisher: Springer Japan
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Abstract
FT-IR is quite suitable for studying thin films (or molecular adsorbates) on a solid or liquid surface because of the high sensitivity and quantitatively great reproducibility, which perfectly matches the theoretical prediction based on electrodynamics. Here, the thickness of the thin film is much less than the wavelength of IR light, i.e., a few hundreds of nm or less. In this situation, the optical interfaces of film/air and film/substrate significantly influence the IR spectra even when the simple transmission technique is employed. Since a unique research field of spectroscopy is formed about an interface, this field should be named surface spectroscopy. The theoretical aspect of surface spectroscopy is a little complicated, but the conclusions are concisely summarized as the surface selection rules (SSR). In this chapter, let us imagine a thin film deposited on a substrate, and the physical concept is introduced in detail, followed by the practical applications based on SSR.