Nonstoichiometric Intensities in Core Photoelectron Spectroscopy

J. Söderström, N. Mårtensson, O. Travnikova, M. Patanen, C. Miron, L. J. Sæthre, K. J. Børve, J. J. Rehr, J. J. Kas, F. D. Vila, T. D. Thomas, and S. Svensson
Phys. Rev. Lett. 108, 193005 – Published 11 May 2012
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Abstract

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.

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  • Received 2 December 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.193005

© 2012 American Physical Society

Authors & Affiliations

J. Söderström1, N. Mårtensson1, O. Travnikova2, M. Patanen2, C. Miron2, L. J. Sæthre3, K. J. Børve3, J. J. Rehr4, J. J. Kas4, F. D. Vila4, T. D. Thomas5, and S. Svensson1

  • 1Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden
  • 2Synchrotron SOLEIL, l’Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
  • 3Department of Chemistry, University of Bergen, Allégaten 41, NO-5007 Bergen, Norway
  • 4Department of Physics, Box 351560, University of Washington, Seattle, Washington 98195-1560, USA
  • 5Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA

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Issue

Vol. 108, Iss. 19 — 11 May 2012

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