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X-ray Photoelectron Spectroscopy XPS (Read 3816 times)
Gerrit-Jan Linker
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X-ray Photoelectron Spectroscopy XPS
27.05.10 at 13:15:30
 
X-ray Photoelectron Spectroscopy XPS
 
 
X-ray photoelectron spectroscopy (XPS) is a quantitative spectroscopic technique that measures the elemental composition, empirical formula, chemical state and electronic state of the elements that exist within a material.
 
In XPS the photon is absorbed by an atom in a molecule or solid, leading to ionization and the emission of a core (inner shell) electron.
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« Last Edit: 27.05.10 at 13:16:53 by Gerrit-Jan Linker »  

Gerrit-Jan Linker
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Gerrit-Jan Linker
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XPS: Broadening of peaks
Reply #1 - 18.02.12 at 23:29:47
 
XPS: Broadening of peaks
 
Theory predicts a narrow line. Experiment measures broad lines.
 
Origin of Full Width at Half Maximum (FWHM) can be intrinsic or extrinsic.
 
  • Origin of extrinsic broadening
    Photons are not monochromatic: Lifetime broadening.  
  • Origin of intrinsic broadening
    Lifetime of core-hole. Uncertainty principle ∆E∆t ≥ ћ
    Sample is not uniform
    Vibrational broadening
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    Gerrit-Jan Linker
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