Final-state symmetry of Na1s core-shell excitons in NaCl and NaF

K. P. Nagle, G. T. Seidler, E. L. Shirley, T. T. Fister, J. A. Bradley, and F. C. Brown
Phys. Rev. B 80, 045105 – Published 8 July 2009

Abstract

We report measurements of the Na1s contribution to the nonresonant inelastic x-ray scattering (NRIXS) from NaCl and NaF. Prior x-ray absorption studies have observed two pre-edge excitons in both materials. The momentum-transfer dependence (q dependence) of the measured NRIXS cross section and of real-space full multiple scattering and Bethe-Salpeter calculations determine that the higher-energy core excitons are s type for each material. The lower-energy core excitons contribute at most weakly to the NRIXS signal and we propose that these may be surface core excitons, as have been observed in several other alkali halides. The analysis of the orbital angular momentum of these features leads to a discussion of the limited sensitivity of NRIXS measurements to d-type final states when investigating 1s initial states. In this case the s- and p-type final density of states can be characterized by measurements at a small number of momentum transfers. This is in contrast to the case of more complex initial states for which measurements at a large number of momentum transfers are needed to separate the rich admixture of accessible and contributing final-state symmetries.

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  • Received 27 February 2009

DOI:https://doi.org/10.1103/PhysRevB.80.045105

©2009 American Physical Society

Authors & Affiliations

K. P. Nagle1, G. T. Seidler1,*, E. L. Shirley2, T. T. Fister1,3, J. A. Bradley1, and F. C. Brown1

  • 1Department of Physics, University of Washington, Seattle, Washington 98105, USA
  • 2Optical Technology Division, NIST, Gaithersburg, Maryland 20899-8441, USA
  • 3Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *Corresponding author. seidler@phys.washington.edu

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Vol. 80, Iss. 4 — 15 July 2009

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