Correlation effects for electron-positron momentum density in solids

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.7136· OSTI ID:542635

Barbiellini, B; Hakala, M; Puska, M J; Nieminen, R M ^[1]; Manuel, A A ^[2]

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1. Laboratory of Physics, Helsinki University of Technology, FIN-02150 Espoo (Finland)
2. Department of Physics, University of Geneva, 24 Quai E. Ansermet, 1211 Geneva 4 (Switzerland)

A method describing the calculation of the momentum density of annihilating electron-positron pairs in solids has been developed. One-electron states, which are not perturbed by the positron, are used. The effects due to the enhancement of the electron density near the positron are taken into account by a factor depending on the electron state in the annihilating pair. This enhancement is used both for the valence and core electron states. The calculated momentum densities are in good agreement with the two-dimensional angular correlation of the annihilation radiation measurements in defect-free Cu and GaAs. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 542635
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 12 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR CORRELATION
ANGULAR MOMENTUM
ANNIHILATION
COPPER
ELECTRON DENSITY
LIFETIME
LINEAR MOMENTUM
POSITRON COLLISIONS
POSITRONS
SOLIDS