Abstract
Annihilation momentum densities and vertex enhancement factors for positron annihilation on valence and core electrons of noble-gas atoms are calculated using many-body theory for s, p and d-wave positrons of momenta up to the positronium-formation threshold. The enhancement factors parametrize the effects of short-range electron-positron correlations which increase the annihilation probability beyond the independent-particle approximation. For all positron partial waves and electron subshells, the enhancement factors are found to be relatively insensitive to the positron momentum. The enhancement factors for the core electron orbitals are also almost independent of the positron angular momentum. The largest enhancement factor (∼10) is found for the 5p orbital in Xe, while the values for the core orbitals are typically ∼1.5.
Original language | English |
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Title of host publication | Concepts, methods and applications of quantum systems in chemistry and physics: selected proceedings of QSCP-XXI |
Editors | Yan A. Wang, Mark Thachuk, Roman Krems, Jean Maruani |
Publisher | Springer Cham |
Pages | 243-263 |
ISBN (Electronic) | 9783319745824 |
ISBN (Print) | 9783030090289, 9783319745817 |
DOIs | |
Publication status | Published - 18 May 2018 |
Event | 21th International Workshop on Quantum Systems in Chemistry, Physics, and Biology 2016 - University of British Columbia, Vancouver, Canada Duration: 02 Jun 2016 → 09 Jun 2016 https://groups.chem.ubc.ca/qscp/ |
Publication series
Name | Progress in Theoretical Chemistry and Physics |
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Publisher | Springer |
Volume | 31 |
ISSN (Print) | 1567-7354 |
Conference
Conference | 21th International Workshop on Quantum Systems in Chemistry, Physics, and Biology 2016 |
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Abbreviated title | QSCP XXI |
Country/Territory | Canada |
City | Vancouver |
Period | 02/06/2016 → 09/06/2016 |
Internet address |