Momentum distributions of electron-positron pairs annihilating at vacancy clusters in Si

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorHakala, M.
dc.contributor.authorPuska, M.J.
dc.contributor.authorNieminen, R.M.
dc.contributor.departmentDepartment of Applied Physics
dc.date.accessioned2017-10-13T10:32:06Z
dc.date.available2017-10-13T10:32:06Z
dc.date.issued1998-04-01
dc.description.abstractWe report calculations of momentum densities of electron-positron pairs annihilating at various vacancy clusters in Si. The densities integrated along one direction, i.e., those corresponding to the spectra measured by the two-dimensional angular correlation of the annihilation radiation method, are shown to be isotropic if the positron is captured by a small vacancy cluster. The densities integrated along two directions correspond to the one-dimensional angular-correlation distribution or the Doppler-broadened annihilation radiation line shape. The characteristic narrowing of these one-dimensional distributions at vacancy clusters is demonstrated. The line-shape parameters S and W describing mainly the annihilations with valence and core electrons, respectively, are calculated and compared quantitatively with experimental data. We find a systematic increase in the S and a decrease in the W parameter as the size of the vacancy increases.en
dc.description.versionPeer revieweden
dc.format.extent7
dc.format.extent7621-7627
dc.format.mimetypeapplication/pdf
dc.identifier.citationHakala , M , Puska , M J & Nieminen , R M 1998 , ' Momentum distributions of electron-positron pairs annihilating at vacancy clusters in Si ' , Physical Review B , vol. 57 , no. 13 , pp. 7621-7627 . https://doi.org/10.1103/PhysRevB.57.7621en
dc.identifier.doi10.1103/PhysRevB.57.7621
dc.identifier.issn2469-9950
dc.identifier.issn1550-235X
dc.identifier.otherPURE UUID: 1b2648b5-3098-4d41-98e0-a133047e2f50
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/1b2648b5-3098-4d41-98e0-a133047e2f50
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/14680229/PhysRevB.57.7621.pdf
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/28132
dc.identifier.urnURN:NBN:fi:aalto-201710136993
dc.language.isoenen
dc.relation.ispartofseriesPHYSICAL REVIEW Ben
dc.relation.ispartofseriesVolume 57, issue 13en
dc.rightsopenAccessen
dc.titleMomentum distributions of electron-positron pairs annihilating at vacancy clusters in Sien
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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