Electron-positron momentum density distribution in diamond

R. W.N. Nilen, S. H. Connell, W. G. Schmidt, D. T. Britton, W. S. Verwoerd, J. P.F. Sellschop, S. Shrivastava

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We have measured the momentum distribution of the electron-positron annihilating pair in diamond as a function of crystallographic orientation, using the Doppler broadening technique of positron annihilation spectroscopy. A 1% variation in the longitudinal projection of the momentum distribution was observed as the sample was rotated about the 〈110〉 axis. This anisotropic distribution shows an excellent agreement with a theoretical calculation performed based on two component density functional theory in the local density approximation. The results suggest strongly that the bulk positron density, though delocalized and inhomogeneous, has sufficient amplitude at the infra-bond regions such that the annihilation characteristics are dominated by the bond electron density and momentum distribution.

Original languageEnglish
Pages (from-to)330-334
Number of pages5
JournalApplied Surface Science
Publication statusPublished - May 1997
Externally publishedYes


  • Ab initio pseudopotential
  • Calculation
  • Diamond
  • Doppler broadening

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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