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Article: A novel design for a variable energy positron lifetime spectrometer

TitleA novel design for a variable energy positron lifetime spectrometer
Authors
KeywordsLifetime spectroscopy
Secondary electron
Timing
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/apsusc
Citation
Applied Surface Science, 2008, v. 255 n. 1, p. 122-124 How to Cite?
AbstractWe present computer simulations of a new design of a variable energy positron lifetime beam that uses for a start signal the secondary electron emission from a 25-nm thick carbon foil (C-foil) located in front of the sample. A needle of ∼30 μm diameter is positioned on-axis right behind the foil, creating a radial electric field that deflects the secondary electrons radially outward so as to miss the sample and to hit the micro-channel plate (MCP) detector placed down beam. The MCP signal provides the start signal for the positron lifetime spectrometer. A grid can be further introduced between the sample holder and the MCP to yield a cleaner signal by preventing the positrons with large transmitted scattering angle from hitting the MCP. The cylindrical symmetry of this design reduces the experimental complexity and offers good timing resolution. We show that the design is robust against the transmitted energy and angle of the secondary electrons and positrons. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/59634
ISSN
2015 Impact Factor: 3.15
2015 SCImago Journal Rankings: 0.930
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChen, Den_HK
dc.contributor.authorZhang, JDen_HK
dc.contributor.authorCheng, CCen_HK
dc.contributor.authorBeling, CDen_HK
dc.contributor.authorFung, Sen_HK
dc.date.accessioned2010-05-31T03:54:12Z-
dc.date.available2010-05-31T03:54:12Z-
dc.date.issued2008en_HK
dc.identifier.citationApplied Surface Science, 2008, v. 255 n. 1, p. 122-124en_HK
dc.identifier.issn0169-4332en_HK
dc.identifier.urihttp://hdl.handle.net/10722/59634-
dc.description.abstractWe present computer simulations of a new design of a variable energy positron lifetime beam that uses for a start signal the secondary electron emission from a 25-nm thick carbon foil (C-foil) located in front of the sample. A needle of ∼30 μm diameter is positioned on-axis right behind the foil, creating a radial electric field that deflects the secondary electrons radially outward so as to miss the sample and to hit the micro-channel plate (MCP) detector placed down beam. The MCP signal provides the start signal for the positron lifetime spectrometer. A grid can be further introduced between the sample holder and the MCP to yield a cleaner signal by preventing the positrons with large transmitted scattering angle from hitting the MCP. The cylindrical symmetry of this design reduces the experimental complexity and offers good timing resolution. We show that the design is robust against the transmitted energy and angle of the secondary electrons and positrons. © 2008 Elsevier 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.subjectLifetime spectroscopyen_HK
dc.subjectSecondary electronen_HK
dc.subjectTimingen_HK
dc.titleA novel design for a variable energy positron lifetime spectrometeren_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0169-4332&volume=255&spage=122&epage=124&date=2008&atitle=A+novel+design+for+a+variable+energy+positron+lifetime+spectrometeren_HK
dc.identifier.emailBeling, CD: cdbeling@hkucc.hku.hken_HK
dc.identifier.emailFung, S: sfung@hku.hken_HK
dc.identifier.authorityBeling, CD=rp00660en_HK
dc.identifier.authorityFung, S=rp00695en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.apsusc.2008.05.190en_HK
dc.identifier.scopuseid_2-s2.0-53049084922en_HK
dc.identifier.hkuros165322en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-53049084922&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume255en_HK
dc.identifier.issue1en_HK
dc.identifier.spage122en_HK
dc.identifier.epage124en_HK
dc.identifier.isiWOS:000259726900032-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridChen, D=7405453717en_HK
dc.identifier.scopusauthoridZhang, JD=8555988600en_HK
dc.identifier.scopusauthoridCheng, CC=23003304100en_HK
dc.identifier.scopusauthoridBeling, CD=7005864180en_HK
dc.identifier.scopusauthoridFung, S=7201970040en_HK

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