Observation of Surface Traps and Vacancy Trapping with Slow Positrons
- 30 July 1979
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 43 (5), 391-394
- https://doi.org/10.1103/PhysRevLett.43.391
Abstract
A beam of monoenergetic positrons incident on clean metallic surfaces has been employed to measure positronium yield as a function of sample temperature and positron energy. These results show an increase in the positronium fraction as a function of temperature which is identified as thermally activated detrapping of positrons from a surface trap. Estimates are made of the depths of these traps. Positrons are observed to trap at vacancies and a monovacancy formation enthalpy is extracted from the data utilizing a simple model.Keywords
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