Not always a valid charge reference value (e.g.The C-C component may be set to a binding energy of 284.8eV, by default.C1s spectrum for contamination typically has C-C, C-O-C and O-C=O components.Prevent/minimize chemical damage to the underlying material.Īdventitious carbon contamination is commonly used as a charge reference for XPS spectra. Use lowest energy argon beam available (e.g.Adventitious carbon may be removed by argon sputtering.(Typically with a layer thickness of 1-2nm.) Most samples that have been exposed to the atmosphere will have a detectable quantity ofĪdventitious carbon contamination.Carbonates and Carbides)Īdventitious Carbon Contamination Binding energies of common chemical states:Ĭharge referenced to adventitious C1s, C-C peak at 284.8eV Experimental Information
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