Positron localization effects on the Doppler broadening of the annihilation line: Aluminum as a case study

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorCalloni, A.
dc.contributor.authorDupasquier, A.
dc.contributor.authorFerragut, R.
dc.contributor.authorFolegati, P.
dc.contributor.authorIglesias, M. M.
dc.contributor.authorMakkonen, I.
dc.contributor.authorPuska, Martti J.
dc.contributor.departmentTeknillisen fysiikan laitosfi
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.schoolPerustieteiden korkeakoulufi
dc.contributor.schoolSchool of Scienceen
dc.date.accessioned2015-09-17T09:02:03Z
dc.date.available2015-09-17T09:02:03Z
dc.date.issued2005
dc.description.abstractThe coincidence Doppler broadening (CDB) technique is widely used to measure one-dimensional momentum distributions of annihilation photons, with the aim of obtaining information on the chemical environment of open-volume defects. However, the quantitative analysis of CDB spectra needs to include also purely geometrical effects. A demonstration is given here, on the basis of CDB spectra measured in quenched and in deformed pure aluminum. The comparison of the experimental results with ab initio computations shows that the observed differences come from the difference in free volume seen by positrons trapped in quenched-in vacancies or in vacancylike defects associated to dislocations. The computation reproduces accurately all details of CDB spectra, including the peak near the Fermi break, which is due to the zero-point motion of the confined positron.en
dc.description.versionPeer revieweden
dc.format.extent054112/1-6
dc.format.mimetypeapplication/pdfen
dc.identifier.citationCalloni, A. & Dupasquier, A. & Ferragut, R. & Folegati, P. & Iglesias, M. M. & Makkonen, I. & Puska, Martti J. 2005. Positron localization effects on the Doppler broadening of the annihilation line: Aluminum as a case study. Physical Review B. Volume 72, Issue 5. 054112/1-6. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.72.054112.en
dc.identifier.doi10.1103/physrevb.72.054112
dc.identifier.issn1550-235X (electronic)
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/17686
dc.identifier.urnURN:NBN:fi:aalto-201509164292
dc.language.isoenen
dc.publisherAmerican Physical Society (APS)en
dc.relation.ispartofseriesPhysical Review Ben
dc.relation.ispartofseriesVolume 72, Issue 5
dc.rights© 2005 American Physical Society (APS). This is the accepted version of the following article: Calloni, A. & Dupasquier, A. & Ferragut, R. & Folegati, P. & Iglesias, M. M. & Makkonen, I. & Puska, Martti J. 2005. Positron localization effects on the Doppler broadening of the annihilation line: Aluminum as a case study. Physical Review B. Volume 72, Issue 5. 054112/1-6. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.72.054112, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.72.054112.en
dc.rights.holderAmerican Physical Society (APS)
dc.subject.keywordpositron annihilationen
dc.subject.keywordcoincidence Doppler broadening techniqueen
dc.subject.otherPhysicsen
dc.titlePositron localization effects on the Doppler broadening of the annihilation line: Aluminum as a case studyen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.dcmitypetexten
dc.type.versionFinal published versionen
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