Chemical identity of atoms using core electron annihilations

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Positron annihilation spectroscopy is a sensitive probe for studying the electronic structure of defects in solids. 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 and by imposing appropriate kinematic cuts to exclude background events. The new setup improves the peak to background ratio in the annihilation spectrum to {approximately}10{sup 5}. As a result, the line shape variations arising from different core electrons can be studied. The new approach adds elemental specificity to the Doppler broadening technique, and is useful in studying elemental ... continued below

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8 p.

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Asoka-Kumar, P. June 27, 1997.

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Positron annihilation spectroscopy is a sensitive probe for studying the electronic structure of defects in solids. 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 and by imposing appropriate kinematic cuts to exclude background events. The new setup improves the peak to background ratio in the annihilation spectrum to {approximately}10{sup 5}. As a result, the line shape variations arising from different core electrons can be studied. The new approach adds elemental specificity to the Doppler broadening technique, and is useful in studying elemental variations around a defect site. Results from several case studies are reviewed.

Physical Description

8 p.

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OSTI as DE98052123

Other: FDE: PDF; PL:

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  • 11. international conference on positron annihilation (ICPA-11), Kansas City, MO (United States), 24-30 May 1997

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  • Other: DE98052123
  • Report No.: UCRL-JC--127860
  • Report No.: CONF-9705156--
  • Grant Number: W-7405-ENG-48;AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 300394
  • Archival Resource Key: ark:/67531/metadc680765

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 27, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 6, 2017, 6:12 p.m.

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Asoka-Kumar, P. Chemical identity of atoms using core electron annihilations, article, June 27, 1997; California. (digital.library.unt.edu/ark:/67531/metadc680765/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.