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 ? 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.
|Title of host publication||Characterization of materials|
|Editors||Elton N. Kaufmann|
|Place of Publication||Hoboken, N.J.|
|Publisher||John Wiley & Sons Inc.|
|Number of pages||7|
|Publication status||Published - 1 Dec 2012|