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XPS Kinetic Energies & Auger Peaks Analysis

Calculate Auger peak kinetic energies using XPS data; Identify Fe XPS features & peak ratios from spectra; Analyze XPS intensity with sample rotation angle; Determine absorbate-substrate XPS peak ratio for 2x2 structure; Calculate superstructure coverage using Woods & Matrix notation.

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XPS Kinetic Energies & Auger Peaks Analysis

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  1. 1. There is certain element, XPS shows the kinetic energies for 1s, 2s, 2p1/2, 2p3/2 are E1s, E2s, E2p1, and E2p2, respectively, Please give the kinetic energies of Auger peaks KL1L2, KL1L3, and KL2L3, respectively by the same analyzer. The light source have energy of hn, and the work function of analyzer is W.

  2. 2. The shown spectra are XPS for Fe with different X-ray source, please tell the 8 strong features’ origins (XPS or AES) in first graph, what is the highest two peak? DO you know roughly the peak ratio? Mg 1253.6 Al 1486.6

  3. 3. Assuming the x-ray can penetrate the whole sample, a chamber is with fixed geometry of x-ray tube and analyzer, both are in the horizontal plane with an angle of 45 degree, the sample can be rotated, gives the intensity of XPS as function of rotation angle q (the sample normal to the analyzer is 0O and the x-ray tube is very broad light source can cover the whole sample.). If the light source is changed to very fine beam from synchrotron with the same geometry, gives again the formula.

  4. 4.Absorbate on certain substrate have a c(2X2) structure, if assume the corresponding XPS peaks for absorbate and substrate (both are single element) are Ia and Is, please give the ratio Ia/Is. Give the free path length the same for both element photoemission and the S factor also same, the measurement is performed along normal.The out-of-plane lattice parameter of the absorbate is a.

  5. 5. Woods and Matrix notation for the following superstructure and calculate coverage. Fcc (111)

  6. 6. Woods and Matrix notation for the following superstructure and calculate coverage.

  7. 7.Gives the reciprocal lattice for the superstructure and substrate (LEED pattern). For training you can also give the reciprocal for the question g. You should also able to derive structure in real space from the LEED pattern.

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