{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25341"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25341","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Soft x-ray near edge spectroscopy of cuprous oxide and silicon-germanium alloys","abstract":"High resolution soft x-ray absorption near edge structure (XANES) spectra have been obtained for CU20 and for SiGe1-x semiconductor alloys, xas a function of composition x, using the methods of partial electron yield and thin film absorption. The shapes of the near edge features provide a unique fingerprint of the local crystal structure (symmetries, coordinations, bond lengths, etc.) in the bulk. A strong asymmetric peak at threshold in Cu20 is probably best described as a Frenkel core exciton corresponding to an allowed Cu 2p + alg molecular orbital transition of the rare linear (0-Cu-0)3-molecular unit characteristic of Cu20. A dramatic change in the observed soft x-ray absorption near edge structure (XANES) for x = 0.15 in SixGe1-x is consistent with the x-dependence predicted for this alloy system by Newman and Dow. The design, operating characteristics, and advantages of the University of Illinois beam line at the 1 GeV electron storage ring Aladdin, including the new extended range grasshopper (ERG) grazing incidence grating monochromator for use in the VUV and soft x-ray spectral ranges, are presented.","abstract_html":"High resolution soft x-ray absorption near edge structure (XANES) spectra have been obtained for CU20 and for SiGe1-x semiconductor alloys, xas a function of composition x, using the methods of partial electron yield and thin film absorption. The shapes of the near edge features provide a unique fingerprint of the local crystal structure (symmetries, coordinations, bond lengths, etc.) in the bulk. A strong asymmetric peak at threshold in Cu20 is probably best described as a Frenkel core exciton corresponding to an allowed Cu 2p + alg molecular orbital transition of the rare linear (0-Cu-0)3-molecular unit characteristic of Cu20. A dramatic change in the observed soft x-ray absorption near edge structure (XANES) for x = 0.15 in SixGe1-x is consistent with the x-dependence predicted for this alloy system by Newman and Dow. The design, operating characteristics, and advantages of the University of Illinois beam line at the 1 GeV electron storage ring Aladdin, including the new extended range grasshopper (ERG) grazing incidence grating monochromator for use in the VUV and soft x-ray spectral ranges, are presented.","abstract_has_math":false,"creators":["Hulbert, Steven Lloyd"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Brown, Frederick C."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-06-07T17:25:19Z","date_published":"2011-06-07T17:25:19Z","updated_at":"2026-07-22T22:25:24Z","subjects":["high resolution soft x-ray absroption near edge structure (XANES)","silicon-germanium semiconductor alloys","cuprous oxide","crystal structure"],"languages":["en"],"rights":["1984 Steven Lloyd Hulbert"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["824806"],"render_values":[{"text":"824806","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25341","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Brown, Frederick C."]},{"key":"dc:creator","label":"Author","values":["Hulbert, Steven Lloyd"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-06-07T17:25:19Z","10000-01-01","1984"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["high resolution soft x-ray absroption near edge structure (XANES)","silicon-germanium semiconductor alloys","cuprous oxide","crystal structure"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1984 Steven Lloyd Hulbert"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["824806","http://hdl.handle.net/2142/25341"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["High resolution soft x-ray absorption near edge structure (XANES) spectra have been obtained for CU20 and for SiGe1-x semiconductor alloys, xas a function of composition x, using the methods of partial electron yield and thin film absorption. The shapes of the near edge features provide a unique fingerprint of the local crystal structure (symmetries, coordinations, bond lengths, etc.) in the bulk. A strong asymmetric peak at threshold in Cu20 is probably best described as a Frenkel core exciton corresponding to an allowed Cu 2p + alg molecular orbital transition of the rare linear (0-Cu-0)3-molecular unit characteristic of Cu20. A dramatic change in the observed soft x-ray absorption near edge structure (XANES) for x = 0.15 in SixGe1-x is consistent with the x-dependence predicted for this alloy system by Newman and Dow. The design, operating characteristics, and advantages of the University of Illinois beam line at the 1 GeV electron storage ring Aladdin, including the new extended range grasshopper (ERG) grazing incidence grating monochromator for use in the VUV and soft x-ray spectral ranges, are presented.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T17:25:19Z No. of bitstreams: 1 1984_hulbert.pdf: 4608401 bytes, checksum: 45065b7c6a7ce4953df7659294c6e820 (MD5)","Made available in DSpace on 2011-06-07T17:25:19Z (GMT). No. of bitstreams: 1 1984_hulbert.pdf: 4608401 bytes, checksum: 45065b7c6a7ce4953df7659294c6e820 (MD5) Previous issue date: 1984","Restriction data tranferred 2014-07-01T11:14:34-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T17:25:20Z Item is restricted indefinitely.","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Soft x-ray near edge spectroscopy of cuprous oxide and silicon-germanium alloys"]}]}],"canonical_facts":{"dc:contributor":["Brown, Frederick C."],"dc:creator":["Hulbert, Steven Lloyd"],"dc:date":["2011-06-07T17:25:19Z","10000-01-01","1984"],"dc:description":["High resolution soft x-ray absorption near edge structure (XANES) spectra have been obtained for CU20 and for SiGe1-x semiconductor alloys, xas a function of composition x, using the methods of partial electron yield and thin film absorption. The shapes of the near edge features provide a unique fingerprint of the local crystal structure (symmetries, coordinations, bond lengths, etc.) in the bulk. A strong asymmetric peak at threshold in Cu20 is probably best described as a Frenkel core exciton corresponding to an allowed Cu 2p + alg molecular orbital transition of the rare linear (0-Cu-0)3-molecular unit characteristic of Cu20. A dramatic change in the observed soft x-ray absorption near edge structure (XANES) for x = 0.15 in SixGe1-x is consistent with the x-dependence predicted for this alloy system by Newman and Dow. The design, operating characteristics, and advantages of the University of Illinois beam line at the 1 GeV electron storage ring Aladdin, including the new extended range grasshopper (ERG) grazing incidence grating monochromator for use in the VUV and soft x-ray spectral ranges, are presented.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T17:25:19Z No. of bitstreams: 1 1984_hulbert.pdf: 4608401 bytes, checksum: 45065b7c6a7ce4953df7659294c6e820 (MD5)","Made available in DSpace on 2011-06-07T17:25:19Z (GMT). No. of bitstreams: 1 1984_hulbert.pdf: 4608401 bytes, checksum: 45065b7c6a7ce4953df7659294c6e820 (MD5) Previous issue date: 1984","Restriction data tranferred 2014-07-01T11:14:34-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-07T17:25:20Z Item is restricted indefinitely.","Thesis","U of I Only"],"dc:identifier":["824806","http://hdl.handle.net/2142/25341"],"dc:language":["en"],"dc:rights":["1984 Steven Lloyd Hulbert"],"dc:subject":["high resolution soft x-ray absroption near edge structure (XANES)","silicon-germanium semiconductor alloys","cuprous oxide","crystal structure"],"dc:title":["Soft x-ray near edge spectroscopy of cuprous oxide and silicon-germanium alloys"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:24Z"}