The effect of light on positron annihilation in natural diamond

R. W.N. Nilen, U. Lauff, S. H. Connell, H. Stoll, A. Siegle, H. Schneider, P. Castellaz, J. Kraft, K. Bharuth-Ram, J. P.F. Sellschop, A. Seeger

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The age-momentum correlation (AMOC) technique of positron annihilation spectroscopy has been used to study a gamma-irradiated natural diamond sample. A light-induced reversible change in both the intensity and the lifetime of the trapped positron component in diamond was observed. No signal attributable to positronium was detected in the measurements, supporting the view that positronium formation does not occur in diamond. The measurements demonstrate the sensitivity of positron annihilation to optically active centers in diamond.

Original languageEnglish
Pages (from-to)198-202
Number of pages5
JournalApplied Surface Science
Publication statusPublished - May 1997
Externally publishedYes


  • Age-momentum correlation
  • Diamond
  • Gamma-irradiation
  • Optical activity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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