{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23981"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23981","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The effect of applied uniaxial stresses on the optical absorption of F centers in alkali halides","abstract":"The method of moments is used to analyze the effect of applied uniaxial stresses on the optical absorption of alkali halides containing F centers. By measuring the first moment change of the F band due to uniaxial stresses applied in (100) and (1l0) directions,' the coupling of the F center excited state to lattice distortions of tetragonal and trigonal symmetry is evaluated. By measuring the third moment change due to the same ~pplied stresses, the separate contributions to the second moment of the F band of dynamic lattice distortions of tetragonal, trigonal, and breathing symmetries are evaluated. I Measurements of the zeroth moment change due to applied .stresses allow evaluation of the validity of the Condon approximation. Calculations based on three simple models of the K band are compared with the results of a measurement of the change in zeroth and-first moments of the K band produced by applied uniaxial stresses. The temperature dependence of the zeroth and first moments of the K band is calculated for the same three models. The results indicate that the K band is .. not .. due to transitions to a state of even parity. Brief measurements of the stress-induced dichroism in the Vl' R, and M band regions are reported.","abstract_html":"The method of moments is used to analyze the effect of applied uniaxial stresses on the optical absorption of alkali halides containing F centers. By measuring the first moment change of the F band due to uniaxial stresses applied in (100) and (1l0) directions,' the coupling of the F center excited state to lattice distortions of tetragonal and trigonal symmetry is evaluated. By measuring the third moment change due to the same ~pplied stresses, the separate contributions to the second moment of the F band of dynamic lattice distortions of tetragonal, trigonal, and breathing symmetries are evaluated. I Measurements of the zeroth moment change due to applied .stresses allow evaluation of the validity of the Condon approximation. Calculations based on three simple models of the K band are compared with the results of a measurement of the change in zeroth and-first moments of the K band produced by applied uniaxial stresses. The temperature dependence of the zeroth and first moments of the K band is calculated for the same three models. The results indicate that the K band is .. not .. due to transitions to a state of even parity. Brief measurements of the stress-induced dichroism in the Vl' R, and M band regions are reported.","abstract_has_math":false,"creators":["Schnatterly, Stephen Eugene"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Compton, W.D."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-20T15:25:45Z","date_published":"2011-05-20T15:25:45Z","updated_at":"2026-07-22T22:25:23Z","subjects":["applied uniaxial stresses","optical absorption","f centers","alkali halides","F band","lattice distortions","tetragonal symmetry","trigonal symmetry"],"languages":["en"],"rights":["1965 Stephen Eugene Schnatterly"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["6188880"],"render_values":[{"text":"6188880","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23981","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Compton, W.D."]},{"key":"dc:creator","label":"Author","values":["Schnatterly, Stephen Eugene"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-20T15:25:45Z","10000-01-01","1965"]},{"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":["applied uniaxial stresses","optical absorption","f centers","alkali halides","F band","lattice distortions","tetragonal symmetry","trigonal symmetry"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1965 Stephen Eugene Schnatterly"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["6188880","http://hdl.handle.net/2142/23981"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The method of moments is used to analyze the effect of applied uniaxial stresses on the optical absorption of alkali halides containing F centers. By measuring the first moment change of the F band due to uniaxial stresses applied in (100) and (1l0) directions,' the coupling of the F center excited state to lattice distortions of tetragonal and trigonal symmetry is evaluated. By measuring the third moment change due to the same ~pplied stresses, the separate contributions to the second moment of the F band of dynamic lattice distortions of tetragonal, trigonal, and breathing symmetries are evaluated. I Measurements of the zeroth moment change due to applied .stresses allow evaluation of the validity of the Condon approximation. Calculations based on three simple models of the K band are compared with the results of a measurement of the change in zeroth and-first moments of the K band produced by applied uniaxial stresses. The temperature dependence of the zeroth and first moments of the K band is calculated for the same three models. The results indicate that the K band is .. not .. due to transitions to a state of even parity. Brief measurements of the stress-induced dichroism in the Vl' R, and M band regions are reported.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-20T15:25:45Z No. of bitstreams: 1 1965_schnatterly.pdf: 8209634 bytes, checksum: b2cd9f13cc9c47126bf0e00749af1192 (MD5)","Made available in DSpace on 2011-05-20T15:25:45Z (GMT). No. of bitstreams: 1 1965_schnatterly.pdf: 8209634 bytes, checksum: b2cd9f13cc9c47126bf0e00749af1192 (MD5) Previous issue date: 1965","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-05-20T15:25:45Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:13:11-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["The effect of applied uniaxial stresses on the optical absorption of F centers in alkali halides"]}]}],"canonical_facts":{"dc:contributor":["Compton, W.D."],"dc:creator":["Schnatterly, Stephen Eugene"],"dc:date":["2011-05-20T15:25:45Z","10000-01-01","1965"],"dc:description":["The method of moments is used to analyze the effect of applied uniaxial stresses on the optical absorption of alkali halides containing F centers. By measuring the first moment change of the F band due to uniaxial stresses applied in (100) and (1l0) directions,' the coupling of the F center excited state to lattice distortions of tetragonal and trigonal symmetry is evaluated. By measuring the third moment change due to the same ~pplied stresses, the separate contributions to the second moment of the F band of dynamic lattice distortions of tetragonal, trigonal, and breathing symmetries are evaluated. I Measurements of the zeroth moment change due to applied .stresses allow evaluation of the validity of the Condon approximation. Calculations based on three simple models of the K band are compared with the results of a measurement of the change in zeroth and-first moments of the K band produced by applied uniaxial stresses. The temperature dependence of the zeroth and first moments of the K band is calculated for the same three models. The results indicate that the K band is .. not .. due to transitions to a state of even parity. Brief measurements of the stress-induced dichroism in the Vl' R, and M band regions are reported.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-20T15:25:45Z No. of bitstreams: 1 1965_schnatterly.pdf: 8209634 bytes, checksum: b2cd9f13cc9c47126bf0e00749af1192 (MD5)","Made available in DSpace on 2011-05-20T15:25:45Z (GMT). No. of bitstreams: 1 1965_schnatterly.pdf: 8209634 bytes, checksum: b2cd9f13cc9c47126bf0e00749af1192 (MD5) Previous issue date: 1965","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-05-20T15:25:45Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:13:11-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["6188880","http://hdl.handle.net/2142/23981"],"dc:language":["en"],"dc:rights":["1965 Stephen Eugene Schnatterly"],"dc:subject":["applied uniaxial stresses","optical absorption","f centers","alkali halides","F band","lattice distortions","tetragonal symmetry","trigonal symmetry"],"dc:title":["The effect of applied uniaxial stresses on the optical absorption of F centers in alkali halides"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:23Z"}