Some papers mention S 2p when they really mean S 2p3/2, these are not interchangeable! Please remember to be specific about the exact peak you are referring to. Spectra result from within the top 10 nm of the surface, which allows XPS to focus on the crucial surface area. XPS is an extremely surface-sensitive technique, too. Samples are analyzed under vacuum, and so surface changes during the analysis are kept to a minimum. There is a lot of confusion in the literature when presenting the data for sulphur. XPS is an excellent technique for this type of characterization. S2p peak has closely spaced spin-orbit components. Ī Na2S2O3.5H2O (sodium thiosulphite cooled to -130C during analysis) reference sample gave S 2p3/2 peak positions of 162.1 eV and 168.1 eV for S*SO3 and SS*O3 moieties, respectively. Sulfur Non-Metals Sulfur-containing self-assembled monolayers (SAMs) may be damaged by exposure to X-rays. This work shows that sulfide coordination changes can be seen by XPS. In a recent paper from Sarah Harmer's group at Flinders University, synchrotron XPS is used to convincingly elucidate surface 3-coordinate, bulk and surface 4-coordinate and bulk 5-coordinate sulfur in the chalcogenide (Fe,Ni)9S8. Available in various sizes: laminated Letter size, 11x17', 2x3 ft, 3x5 ft, 4圆 ft wall and desk charts. A more detailed look at organic sulphur species can be found here. XPS Data for Peak-fitting: Glove Residues: BE Lookup Table: Carbide C 1s BEs: Fundamental XPS Data (PDF) Reliable Binding Energiess and FWHMs from Pure Elements, Pure Metal Oxides and Chemical Compounds. give a value of 162.2 eV for the disulphide in arsenopyrite. Surface species can also play a role in XPS, especially for in-situ fractured sulphide mineral species. Of particular interest is the assignment for polysulphides eg. These ranges can be used with other sulphur containing systems as well. give an excellent overview of binding energy ranges for the study of mineral surfaces.