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X-ray Photoelectron Spectroscopy

X-ray photoelectron spectroscopy (XPS) is a powerful method to study chemical properties of a sample and is often referred to as electron spectroscopy for chemical analysis (ESCA). In XPS photons with a energy hν are absorbed by a system and core electrons are emitted. The kinetic energy of these electrons are measured with an energy analyzer. They are given by Ekin = hν - EB - φsp , where EB is the binding energy and φsp is the work function of the spectrometer. Since binding energies of core electrons are characteristic for elements in a certain chemical environment XPS allows for a determination of the atomic compositions of a sample or the chemical state of an certain element. In many cases chemical shifts can be used to draw direct conclusions on the local coordination in a system. For adsorbates, this often allows to distinguish different adsorption sites of molecules adsorbed on a surface.
Stockholm University |AlbaNova University Center| Fysikum |Updated 14 June 2010 | back to top |