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Article: A compact mono-energetic positron beam for re-emitted positron measurement

TitleA compact mono-energetic positron beam for re-emitted positron measurement
Authors
Weng, HMLing, CCHui, IPBeling, CDFung, S
KeywordsChannel electron multiplier
Conversion efficiency
GaN
Positron beam
SiC
Slow positron re-emission
Issue Date2002
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apsusc
Citation
Applied Surface Science, 2002, v. 194 n. 1-4, p. 24-28 How to Cite?
DOI: http://dx.doi.org/10.1016/S0169-4332(02)00082-X
AbstractA compact mono-energetic positron beam system has been constructed at The University of Hong Kong in order to perform positron re-emission measurements, after fast positrons from a radioactive 22Na source moderated by a variety of samples. The positron re-emission measurements are performed at a vacuum of 10-8 Torr. Re-emitted slow positrons are guided by longitudinal magnetic fields provided by three field coils located outside the vacuum tank and are detected by a gamma photon insensitive channel electron multiplier (CEM). The radioactive source, the sample, the focusing grid, the retarding-field energy analyzer (RFA) and the CEM detector were put into a compact assembly having a length of 33 cm and a diameter of 6 cm. Positron re-emission from W(1 1 1), GaN/SiC, Ga/GaN/SiC, 4H and 6H-SiC surfaces have been studied. The moderator conversion efficiencies of these samples are reported. © 2002 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/80707
ISSN
0169-4332
2021 Impact Factor: 7.392
2020 SCImago Journal Rankings: 1.295
ISI Accession Number ID
WOS:000177499200007
References
References in Scopus

 

DC FieldValueLanguage
dc.contributor.authorWeng, HMen_HK
dc.contributor.authorLing, CCen_HK
dc.contributor.authorHui, IPen_HK
dc.contributor.authorBeling, CDen_HK
dc.contributor.authorFung, Sen_HK
dc.date.accessioned2010-09-06T08:09:24Z-
dc.date.available2010-09-06T08:09:24Z-
dc.date.issued2002en_HK
dc.identifier.citationApplied Surface Science, 2002, v. 194 n. 1-4, p. 24-28en_HK
dc.identifier.issn0169-4332en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80707-
dc.description.abstractA compact mono-energetic positron beam system has been constructed at The University of Hong Kong in order to perform positron re-emission measurements, after fast positrons from a radioactive 22Na source moderated by a variety of samples. The positron re-emission measurements are performed at a vacuum of 10-8 Torr. Re-emitted slow positrons are guided by longitudinal magnetic fields provided by three field coils located outside the vacuum tank and are detected by a gamma photon insensitive channel electron multiplier (CEM). The radioactive source, the sample, the focusing grid, the retarding-field energy analyzer (RFA) and the CEM detector were put into a compact assembly having a length of 33 cm and a diameter of 6 cm. Positron re-emission from W(1 1 1), GaN/SiC, Ga/GaN/SiC, 4H and 6H-SiC surfaces have been studied. The moderator conversion efficiencies of these samples are reported. © 2002 Elsevier Science B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apsuscen_HK
dc.relation.ispartofApplied Surface Scienceen_HK
dc.rightsApplied Surface Science. Copyright © Elsevier BV.en_HK
dc.subjectChannel electron multiplieren_HK
dc.subjectConversion efficiencyen_HK
dc.subjectGaNen_HK
dc.subjectPositron beamen_HK
dc.subjectSiCen_HK
dc.subjectSlow positron re-emissionen_HK
dc.titleA compact mono-energetic positron beam for re-emitted positron measurementen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0169-4332&volume=194&spage=24&epage=28&date=2002&atitle=A+compact+mono-energetic+positron+beam+for+re-emitted+positron+measurementen_HK
dc.identifier.emailLing, CC: ccling@hkucc.hku.hken_HK
dc.identifier.emailBeling, CD: cdbeling@hkucc.hku.hken_HK
dc.identifier.emailFung, S: sfung@hku.hken_HK
dc.identifier.authorityLing, CC=rp00747en_HK
dc.identifier.authorityBeling, CD=rp00660en_HK
dc.identifier.authorityFung, S=rp00695en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0169-4332(02)00082-Xen_HK
dc.identifier.scopuseid_2-s2.0-0037150997en_HK
dc.identifier.hkuros67402en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0037150997&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume194en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage24en_HK
dc.identifier.epage28en_HK
dc.identifier.isiWOS:000177499200007-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridWeng, HM=7102468725en_HK
dc.identifier.scopusauthoridLing, CC=13310239300en_HK
dc.identifier.scopusauthoridHui, IP=7004838789en_HK
dc.identifier.scopusauthoridBeling, CD=7005864180en_HK
dc.identifier.scopusauthoridFung, S=7201970040en_HK
dc.identifier.issnl0169-4332-

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