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Optical studies of dilute gold nickel alloys

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dc.contributor.author Bassett, Mark Rodney
dc.date.accessioned 2011-08-25T21:14:09Z
dc.date.accessioned 2022-10-30T18:31:48Z
dc.date.available 2011-08-25T21:14:09Z
dc.date.available 2022-10-30T18:31:48Z
dc.date.copyright 1974
dc.date.issued 1974
dc.identifier.uri https://ir.wgtn.ac.nz/handle/123456789/25872
dc.description.abstract Changes in the reflectivity of gold on alloying with impurity concentrations of transition metals indicate the presence of very strongly scattering virtual bound states near the Fermi level. The experimental determination of these changes in reflectivity involves a modulation technique where pure metal and alloy samples alternately act as reflecting elements in an infra-red spectrometer. Phase sensitive detection then allows ΔR to be measured accurately from visible wavelengths out to 13 μm in the infra-red, with the elimination of several important systematic errors. Kramers-Kronig analysis to generate files of the dielectric constant then allows the response of the medium to be dissociated into an interband part, a Drude conduction electron background and virtual bound state effects characteristic of the alloy. A model describing the localized impurity d-states in terms of a Lorentizian shaped density of states has been used to interpret results specific to gold/nickel alloys. In addition, a generalized Friedel model for a dilute alloy with cellular disorder allows the calculation of virtual bound state parameters from a theorectical point of view, and preliminary results show good agreement with the values measured experimentally. en_NZ
dc.format pdf en_NZ
dc.language en_NZ
dc.language.iso en_NZ
dc.publisher Te Herenga Waka—Victoria University of Wellington en_NZ
dc.title Optical studies of dilute gold nickel alloys en_NZ
dc.type Text en_NZ
vuwschema.type.vuw Awarded Research Masters Thesis en_NZ
thesis.degree.discipline Physics en_NZ
thesis.degree.grantor Te Herenga Waka—Victoria University of Wellington en_NZ
thesis.degree.level Masters en_NZ

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