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Article: Changes in the positron-electron momentum distribution in GaAs brought about by chopped light

TitleChanges in the positron-electron momentum distribution in GaAs brought about by chopped light
Authors
Issue Date2001
PublisherTrans Tech Publications Ltd. The Journal's web site is located at http://www.scientific.net
Citation
Materials Science Forum, 2001, v. 363-365, p. 114-116 How to Cite?
AbstractWe report on an attempt to observe the EL2 → EL2* transition in semi-insulating GaAs using Doppler broadening of annihilation radiation spectroscopy. Unlike the original observation of this transition using positron annihilation spectroscopy, the present method has sought to observe the production of EL2* through a light chopping experiment, where on the half cycle of illumination the EL2* state is formed and on the second half cycle the EL2* thermally quenches back to EL2. While results are at a preliminary state we have obtained evidence for the production of EL2* from the broad-band emission of a Xenon lamp. While calculations suggest that we should be able to see the EL2* from the IR emission (1.3eV) of GaAs light emitting diodes we have not yet been able to achieve this. Reasons why are discussed.
Persistent Identifierhttp://hdl.handle.net/10722/80929
ISSN
2005 Impact Factor: 0.399
References

 

DC FieldValueLanguage
dc.contributor.authorLi, Sen_HK
dc.contributor.authorFung, Sen_HK
dc.contributor.authorBeling, CDen_HK
dc.contributor.authorLing, CCen_HK
dc.date.accessioned2010-09-06T08:11:51Z-
dc.date.available2010-09-06T08:11:51Z-
dc.date.issued2001en_HK
dc.identifier.citationMaterials Science Forum, 2001, v. 363-365, p. 114-116en_HK
dc.identifier.issn0255-5476en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80929-
dc.description.abstractWe report on an attempt to observe the EL2 → EL2* transition in semi-insulating GaAs using Doppler broadening of annihilation radiation spectroscopy. Unlike the original observation of this transition using positron annihilation spectroscopy, the present method has sought to observe the production of EL2* through a light chopping experiment, where on the half cycle of illumination the EL2* state is formed and on the second half cycle the EL2* thermally quenches back to EL2. While results are at a preliminary state we have obtained evidence for the production of EL2* from the broad-band emission of a Xenon lamp. While calculations suggest that we should be able to see the EL2* from the IR emission (1.3eV) of GaAs light emitting diodes we have not yet been able to achieve this. Reasons why are discussed.en_HK
dc.languageengen_HK
dc.publisherTrans Tech Publications Ltd. The Journal's web site is located at http://www.scientific.neten_HK
dc.relation.ispartofMaterials Science Forumen_HK
dc.rightsMaterials Science Forum. Copyright © Trans Tech Publications Ltd.en_HK
dc.titleChanges in the positron-electron momentum distribution in GaAs brought about by chopped lighten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0255-5476&volume=363-365&spage=114&epage=116&date=2001&atitle=Changes+in+the+Positron-Electron+Momentum+Distribution+in+GaAs+Brought+About+by+Chopped+Lighten_HK
dc.identifier.emailFung, S: sfung@hku.hken_HK
dc.identifier.emailBeling, CD: cdbeling@hkucc.hku.hken_HK
dc.identifier.emailLing, CC: ccling@hkucc.hku.hken_HK
dc.identifier.authorityFung, S=rp00695en_HK
dc.identifier.authorityBeling, CD=rp00660en_HK
dc.identifier.authorityLing, CC=rp00747en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0035007920en_HK
dc.identifier.hkuros56850en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0035007920&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume363-365en_HK
dc.identifier.spage114en_HK
dc.identifier.epage116en_HK
dc.publisher.placeSwitzerlanden_HK
dc.identifier.scopusauthoridLi, S=7409241368en_HK
dc.identifier.scopusauthoridFung, S=7201970040en_HK
dc.identifier.scopusauthoridBeling, CD=7005864180en_HK
dc.identifier.scopusauthoridLing, CC=13310239300en_HK

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