By John W. Martin (Eds.)
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Extra resources for The Local Chemical Analysis of Materials
The progress of adsorption and surface reaction is monitored by the application of a second high-voltage desorption pulse and a controlled time delay. The use of the PLAP in adsorption studies has been reviewed by Tsong (1990). A related ﬁeld of investigation is that of catalysis, and any structural and/or morphological changes on the surface of catalyst materials can be followed on the atomic scale by FIM methods. The size and shape of the apex region of an FIM specimen resembles that of a single particle of a supported metal catalyst.
2–25 25–496 496–1240 Wave numbers (¼ frequency/c) 10–200 200–4000 4000–10,000 It is the mid-infrared region that is used for the study of molecular vibrations and is therefore of greatest importance in the present context. The ﬁrst studies in the midIR on catalysis were by Eischens and Pliskin (1958) whose review is still a standard work of reference. 1 Theory of Molecular Vibrations For IR spectroscopy, the process of interest is absorption. Polarization and angledependent measurements are useful when using the transmission geometry.
2 Equipment Most modern IR facilities will use a Fourier Transform IR Spectrometer (FTIR), rather than a dispersive instrument. The essential feature is that all of the light from the source falls on to the detector at any instant, which thus leads to increased signal levels, thereby automatically improving the signal-to-noise ratio at all points on the spectrum. e. the signal is very weak owing to the small number of adsorbing molecules). e. about 1 nmol). 01–2% absorption) can still be recorded at relatively high resolution ($ 1 cmÀ1).
The Local Chemical Analysis of Materials by John W. Martin (Eds.)