positron annihilation analysis

synonym: positron annihilation spectroscopy for chemical analysis (PASCA)
initialism: PAA
https://doi.org/10.1351/goldbook.08750
Measurement principle in which the annihilation of positrons is applied to study the microscopic structure of materials.
Notes:
  1. Annihilation lifetime (see: positron lifetime spectrometry), Doppler broadening, and the angular correlation of annihilation radiation are measured in this technique.
  2. In the most common case of positron annihilation, two photons are created, each with energy equal to the rest energy of the electron or positron (0.511 MeV=8.187122600×10−14 J).
  3. Techniques based on PAA have been used particularly for the study polymers.
Source:
PAC, 2021, 93, 69. (Vocabulary of radioanalytical methods (IUPAC Recommendations 2020)) on page 92 [Terms] [Paper]
Citation: 'positron annihilation analysis' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08750 RIS BibTex EndNote
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