Positron Annihilation Studies of Materials
Published Online: 12 OCT 2012
Copyright © 2003 by John Wiley & Sons, Inc. All rights reserved.
Characterization of Materials
How to Cite
Keeble, D. J., Brossmann, U., Puff, W. and Würschum, R. 2012. Positron Annihilation Studies of Materials. Characterization of Materials. 1–28.
- Published Online: 12 OCT 2012
Positron annihilation provides sensitive and versatile probe techniques in materials science that can characterize electronic structure and vacancy-type, open volume, defects. The techniques utilize the information carried by the photons that result from the quantum relativistic process of the annihilation of a positron with its antiparticle the electron. For the implanted positron, the time to the annihilation event with a host electron depends on the electron density of the local environment probed. Annihilation normally results in the conversion to two anticolinear γ photons, this emitted radiation carries information on the momentum of the electron -positron pair at the instant of annihilation.
The present article focuses on the standard e+ annihilation methods applied to the study of defects in materials. Current developments in e+ annihilation are briefly described.
- crystal defects;
- open-volume defects;
- electron momentum;
- Doppler broadening;
- positron lifetime spectroscopy;
- angular correlation of annihilation radiation (ACAR);
- positron beam techniques