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Nonstoichiometric Intensities in Core Photoelectron Spectroscopy

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https://ir.library.oregonstate.edu/concern/articles/dr26xz04h

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  • X-ray photoemission spectroscopy is used in a great variety of research fields; one observable is the sample's stoichiometry. The stoichiometry can be deduced based on the expectation that the ionization cross sections for innershell orbitals are independent of the molecular composition. Here we used chlorine-substituted ethanes in the gas phase to investigate the apparent carbon stoichiometry. We observe a nonstoichiometric ratio for a wide range of photon energies, the ratio exhibits x-ray-absorption fine structure spectroscopy (EXAFS)-like oscillations and hundreds of eV above the C1s ionization approaches a value far from 1. These effects can be accounted for by considering the scattering of the outgoing photoelectron, which we model by multiple-scattering EXAFS calculations, and by considering the effects of losses due to monopole shakeup and shakeoff and to intramolecular inelastic scattering processes.
  • This is the publisher’s final pdf. The published article is copyrighted by American Physical Society and can be found at: http://prl.aps.org/
  • Keywords: Absorption fine structure, Photoemission
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  • Soderstrom, J., Martensson, N., Travnikova, O., Patanen, M., Miron, C., Saethre, L., . . . . (2012). Nonstoichiometric intensities in core photoelectron spectroscopy. Physical Review Letters, 108(19) doi: 10.1103/PhysRevLett.108.193005
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  • 108
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  • 19
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  • This work has been supported by the European Union Seventh Framework Programme FP7/2007-2013 under Grant Agreement No. 252781 (O. T.) and I3 program (L. S, S. S.), by the Scientific Research Council (V. R.) in Sweden (S. S., N. M.), by the Norwegian Research Council (K. B., L. S.), by Knut and Alice Wallenbergs Foundation (J. S.), from U.S. Department of Energy Basic Energy Sciences Grant No. DE-FG03-97ER45623 (J. J. R., J. J. K., and F. D.V.) and by Triangle de la Physique, France under Contract No. 2007-010T (S. S.).
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