{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/20145"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/20145","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Higher-order processes in stellar opacities","abstract":"Made available in DSpace on 2011-05-07T12:30:15Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9702493.pdf: 2570929 bytes, checksum: 5033c0bfef533098363e28741dcf7ac0 (MD5) Previous issue date: 1996","abstract_html":"Made available in DSpace on 2011-05-07T12:30:15Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9702493.pdf: 2570929 bytes, checksum: 5033c0bfef533098363e28741dcf7ac0 (MD5) Previous issue date: 1996","abstract_has_math":false,"creators":["Cundiff, Kirby Ray"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Lamb, Frederick K."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:30:15Z","date_published":"2011-05-07T12:30:15Z","updated_at":"2026-07-22T22:25:15Z","subjects":["Physics, Astronomy and Astrophysics"],"languages":["eng"],"rights":["Copyright 1996 Cundiff, Kirby Ray"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591086782","AAI9702493","(UMI)AAI9702493"],"render_values":[{"text":"9780591086782","href":null,"code":true},{"text":"AAI9702493","href":null,"code":true},{"text":"(UMI)AAI9702493","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/20145","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Lamb, Frederick K."]},{"key":"dc:creator","label":"Author","values":["Cundiff, Kirby Ray"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:30:15Z","10000-01-01","1996"]},{"key":"dc:type","label":"Dc Type","values":["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."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Astronomy and Astrophysics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1996 Cundiff, Kirby Ray"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591086782","AAI9702493","(UMI)AAI9702493","http://hdl.handle.net/2142/20145"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Made available in DSpace on 2011-05-07T12:30:15Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9702493.pdf: 2570929 bytes, checksum: 5033c0bfef533098363e28741dcf7ac0 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:41:52Z Item is restricted indefinitely.","In this thesis we calculate the influence of many-body interactions on the opacity the solar core and other non-relativistic astrophysical environments. The many-body interactions are of two basic types-multi-photon and multi-particle. Multi-photon processes of the following types are calculated: two-photon bound-bound absorption, two-photon bound-bound absorption on resonance, two-photon free-free absorption, and double Compton scattering (two photons are absorbed and one is emitted). When the electrons are in free states, higher order corrections to multi-photon interactions (free-free absorption and double Compton scattering) are found to be proportional to the temperature over the plasma frequency, $T/\\omega\\sb{p},$ in most astrophysical environments, where the electron energy width, $\\Gamma\\sb{e},$ is much smaller than the temperature, T. When the electrons are bound, the relationship is somewhat more complicated. The inverse-bremsstrahlung cross-section is calculated in a plasma using the methods of finite temperature field theory to relate it to the imaginary part of the photon self-energy. The importance of multi-particle interactions is found to be determined by the electron energy width over the temperature, $\\Gamma\\sb{e}/T.$ Noise of the cross-section corrections that were calculated contribute an opacity correction that is larger than two percent in any of the astrophysical environments examined (the solar core, the solar interior, and white dwarf envelopes).","Restriction data tranferred 2014-07-01T11:18:10-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Higher-order processes in stellar opacities"]}]}],"canonical_facts":{"dc:contributor":["Lamb, Frederick K."],"dc:creator":["Cundiff, Kirby Ray"],"dc:date":["2011-05-07T12:30:15Z","10000-01-01","1996"],"dc:description":["Made available in DSpace on 2011-05-07T12:30:15Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9702493.pdf: 2570929 bytes, checksum: 5033c0bfef533098363e28741dcf7ac0 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:41:52Z Item is restricted indefinitely.","In this thesis we calculate the influence of many-body interactions on the opacity the solar core and other non-relativistic astrophysical environments. The many-body interactions are of two basic types-multi-photon and multi-particle. Multi-photon processes of the following types are calculated: two-photon bound-bound absorption, two-photon bound-bound absorption on resonance, two-photon free-free absorption, and double Compton scattering (two photons are absorbed and one is emitted). When the electrons are in free states, higher order corrections to multi-photon interactions (free-free absorption and double Compton scattering) are found to be proportional to the temperature over the plasma frequency, $T/\\omega\\sb{p},$ in most astrophysical environments, where the electron energy width, $\\Gamma\\sb{e},$ is much smaller than the temperature, T. When the electrons are bound, the relationship is somewhat more complicated. The inverse-bremsstrahlung cross-section is calculated in a plasma using the methods of finite temperature field theory to relate it to the imaginary part of the photon self-energy. The importance of multi-particle interactions is found to be determined by the electron energy width over the temperature, $\\Gamma\\sb{e}/T.$ Noise of the cross-section corrections that were calculated contribute an opacity correction that is larger than two percent in any of the astrophysical environments examined (the solar core, the solar interior, and white dwarf envelopes).","Restriction data tranferred 2014-07-01T11:18:10-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["9780591086782","AAI9702493","(UMI)AAI9702493","http://hdl.handle.net/2142/20145"],"dc:language":["eng"],"dc:rights":["Copyright 1996 Cundiff, Kirby Ray"],"dc:subject":["Physics, Astronomy and Astrophysics"],"dc:title":["Higher-order processes in stellar opacities"],"dc:type":["text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:15Z"}