RelativeResourceManager(20) - Spectroscopic methods for...

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Spectroscopic methods for characterization of surfaces Chem 420 November 17, 2008 Professor Ryan C. Bailey
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Why study surfaces? z The chemical composition of surfaces is critically important in many processes. z Industrial: Heterogeneous catalysis z Atmospheric: Photolysis of PAHs and many other reactions z Environmental: Degradation of organic contaminants z Previously described spectroscopic methods are applicable, but complicated because of short pathlength z Not studying the bulk
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Surface spectroscopies z Static analysis z Raster imaging – mapping z Depth profiling z Primary beams are commonly electrons, ions, or X-ray photons z Ensures surface sensitivity and not bulk penetration z Penetration depth at 1-keV z Electron/Ion: 2.5 nm z Photon: 1000 nm
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Electron spectroscopies z Measures kinetic energy of emitted electrons. z Capable of detecting every element except H and He z Allows determination of oxidation state and bonding environment z Provides electronic structure information z X-ray photoelectron spectroscopy (XPS)
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This note was uploaded on 04/08/2010 for the course CHEM 420 taught by Professor Bailey during the Spring '08 term at University of Illinois at Urbana–Champaign.

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RelativeResourceManager(20) - Spectroscopic methods for...

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