Role of inversion symmetry and multipole effects in nonresonant x-ray Raman scattering from icosahedral B4C

Yejun Feng, G. T. Seidler, J. O. Cross, A. T. Macrander, and J. J. Rehr
Phys. Rev. B 69, 125402 – Published 8 March 2004
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Abstract

We report nonresonant x-ray Raman scattering (XRS) measurements for the icosahedral boron carbide B4C for transferred momentum q from 1 to 9 Å1. The observed q-dependence together with site-specific ab initio calculations identify a near-edge peak in the XRS spectra as a p-type (Δl=1) exciton due to dominant boron occupation at the sole atomic site in the unit cell having inversion symmetry. This result constrains models of substitutional disorder in B4C, introduces a new application of XRS, and emphasizes the utility of full multiple scattering calculations of the site-specific projected density of states for interpretation of the near edge region of XRS spectra.

  • Received 19 June 2003

DOI:https://doi.org/10.1103/PhysRevB.69.125402

©2004 American Physical Society

Authors & Affiliations

Yejun Feng1, G. T. Seidler1,2,*, J. O. Cross1,2, A. T. Macrander3, and J. J. Rehr1

  • 1Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
  • 2PNC-CAT, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 3Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *Corresponding author. Email address: seidler@phys.washington.edu

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Vol. 69, Iss. 12 — 15 March 2004

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