Positron annihilation in
- 15 May 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 45 (20), 12126-12129
- https://doi.org/10.1103/physrevb.45.12126
Abstract
Positron lifetime experiments have been performed in as a function of (1) pressure up to 14.7 kbar, (2) temperature between 10 and 300 K, and (3) oxygen pressure up to 2 atm. Nearly single lifetimes (356 ps, 98%) have been observed in solids. A large lifetime-pressure variation [(9–3±0.5)× ] and a monotonic lifetime-temperature variation [(1.5±0.2)× ] are observed while the presence of oxygen does not change the positron lifetime. These results are interpreted in terms that the positron is mainly annihilating with electrons near the interstitial octahedral sites of fcc lattices. Results of the calculated positron density distribution support this interpretation.
Keywords
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