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Surface Infrared Spectroscopy

Two Techniques for High Sensitivity Surface Infrared Spectroscopy 

Grazing angle Fourier-transform infrared external reflection spectroscopy is sensitive enough to produce a quality spectrum of less than a monolayer on a surface. The IR beam is reflected off of a sample before going to the detector. (Picture adapted from a diagram originally drawn by Dr. Laurel Knott.)

spectroscopy2When using materials that are transparent to IR radiation, Brewster-angle transmissionFourier-transform infrared spectroscopy is a sensitive method for investigating adsorbates. Using the Brewster angle prevents multiple internal reflections and, hence, interference patterns.