Increased Elemental Specificity of Positron Annihilation Spectra

P. Asoka-Kumar, M. Alatalo, V. J. Ghosh, A. C. Kruseman, B. Nielsen, and K. G. Lynn
Phys. Rev. Lett. 77, 2097 – Published 2 September 1996
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Abstract

Positron annihilation spectroscopy (PAS) is a sensitive probe for studying the electronic structure of defects in solids. We show that the high-momentum part of the Doppler-broadened annihilation spectra can be used to distinguish different elements. This is achieved by using a new two-detector coincidence system to examine the line shape variations originating from high-momentum core electrons. Because the core electrons retain their atomic character even when atoms form a solid, these results can be directly compared to simple theoretical predictions. The new approach adds increased elemental specificity to the PAS technique, and is useful in studying the elemental variations around a defect site.

  • Received 28 March 1996

DOI:https://doi.org/10.1103/PhysRevLett.77.2097

©1996 American Physical Society

Authors & Affiliations

P. Asoka-Kumar1, M. Alatalo1, V. J. Ghosh1, A. C. Kruseman2, B. Nielsen1, and K. G. Lynn1

  • 1Brookhaven National Laboratory, Upton, New York 11973
  • 2IRI, Delft University of Technology, Mekelweg 15, NL-2629JB Delft, The Netherlands

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Vol. 77, Iss. 10 — 2 September 1996

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