{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25716"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25716","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Infrared absorption by localized polarons in the silver halides","abstract":"The infrared absorption of silver halide crystals, induced by simultaneous illumination of the crystals with light whose energy exceeded the indirect band gap, was measured from 33 to 2000 cm-1 at temperatures from. 90 K to 40 0 K. The induced far infrared absorption was shown to be in agreement with the predictions of an extension of the theory of Buimistrov and Pekar for po1arons bound to a positive charge center. In AgBr at 9.30 K, the induced absorption at 168 cm-1 was identified as the 1s to 2p transition, and the absorpti.on at 192 ± 2 cm -1 as the ls to continuum transition. In AgC1 at 9.30 K, the corresponding transitions were at 272 cm and at 292 ± 3 cm The induced infrared absorption at higher frequencies was shown to be phonon side bands of the far infrared. absorption. In the process of calculating the above transitions, the Buimistrov-Pekar expression for the polaron self energy was evaluated in a new manner. The results showed that for coupling constants O! less than 6, the Buimistrov-Pekar formulation gives a lower value of self energy than other polaron theories. The longitudinal optical frequencies in AgBr and AgCl were measured directly for the first time at low temperatures using a variation of the technique of Berreman. At 7oK, the longitudinal optical frequency was 140 ± 1 cm- l in AgBr, and 197 ±l cm-1 in AgCl.","abstract_html":"The infrared absorption of silver halide crystals, induced by simultaneous illumination of the crystals with light whose energy exceeded the indirect band gap, was measured from 33 to 2000 cm-1 at temperatures from. 90 K to 40 0 K. The induced far infrared absorption was shown to be in agreement with the predictions of an extension of the theory of Buimistrov and Pekar for po1arons bound to a positive charge center. In AgBr at 9.30 K, the induced absorption at 168 cm-1 was identified as the 1s to 2p transition, and the absorpti.on at 192 ± 2 cm -1 as the ls to continuum transition. In AgC1 at 9.30 K, the corresponding transitions were at 272 cm and at 292 ± 3 cm The induced infrared absorption at higher frequencies was shown to be phonon side bands of the far infrared. absorption. In the process of calculating the above transitions, the Buimistrov-Pekar expression for the polaron self energy was evaluated in a new manner. The results showed that for coupling constants O! less than 6, the Buimistrov-Pekar formulation gives a lower value of self energy than other polaron theories. The longitudinal optical frequencies in AgBr and AgCl were measured directly for the first time at low temperatures using a variation of the technique of Berreman. At 7oK, the longitudinal optical frequency was 140 ± 1 cm- l in AgBr, and 197 ±l cm-1 in AgCl.","abstract_has_math":false,"creators":["Brandt, Richard Charles"],"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":"2011-07-08T15:54:08Z","date_published":"2011-07-08T15:54:08Z","updated_at":"2026-07-22T22:25:26Z","subjects":["infrared absorption","localized polarons","silver halides","silver halide crystals"],"languages":["en"],"rights":["1967 Richard Charles Brandt"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["6090090"],"render_values":[{"text":"6090090","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25716","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":["Brandt, Richard Charles"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-07-08T15:54:08Z","10000-01-01","1967"]},{"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":["infrared absorption","localized polarons","silver halides","silver halide crystals"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1967 Richard Charles Brandt"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["6090090","http://hdl.handle.net/2142/25716"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The infrared absorption of silver halide crystals, induced by simultaneous illumination of the crystals with light whose energy exceeded the indirect band gap, was measured from 33 to 2000 cm-1 at temperatures from. 90 K to 40 0 K. The induced far infrared absorption was shown to be in agreement with the predictions of an extension of the theory of Buimistrov and Pekar for po1arons bound to a positive charge center. In AgBr at 9.30 K, the induced absorption at 168 cm-1 was identified as the 1s to 2p transition, and the absorpti.on at 192 ± 2 cm -1 as the ls to continuum transition. In AgC1 at 9.30 K, the corresponding transitions were at 272 cm and at 292 ± 3 cm The induced infrared absorption at higher frequencies was shown to be phonon side bands of the far infrared. absorption. In the process of calculating the above transitions, the Buimistrov-Pekar expression for the polaron self energy was evaluated in a new manner. The results showed that for coupling constants O! less than 6, the Buimistrov-Pekar formulation gives a lower value of self energy than other polaron theories. The longitudinal optical frequencies in AgBr and AgCl were measured directly for the first time at low temperatures using a variation of the technique of Berreman. At 7oK, the longitudinal optical frequency was 140 ± 1 cm- l in AgBr, and 197 ±l cm-1 in AgCl.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-08T15:54:08Z No. of bitstreams: 1 1967_brandt.pdf: 3434751 bytes, checksum: f18be66771f6dc5d523ea6c86f252c18 (MD5)","Made available in DSpace on 2011-07-08T15:54:08Z (GMT). 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The induced far infrared absorption was shown to be in agreement with the predictions of an extension of the theory of Buimistrov and Pekar for po1arons bound to a positive charge center. In AgBr at 9.30 K, the induced absorption at 168 cm-1 was identified as the 1s to 2p transition, and the absorpti.on at 192 ± 2 cm -1 as the ls to continuum transition. In AgC1 at 9.30 K, the corresponding transitions were at 272 cm and at 292 ± 3 cm The induced infrared absorption at higher frequencies was shown to be phonon side bands of the far infrared. absorption. In the process of calculating the above transitions, the Buimistrov-Pekar expression for the polaron self energy was evaluated in a new manner. The results showed that for coupling constants O! less than 6, the Buimistrov-Pekar formulation gives a lower value of self energy than other polaron theories. The longitudinal optical frequencies in AgBr and AgCl were measured directly for the first time at low temperatures using a variation of the technique of Berreman. At 7oK, the longitudinal optical frequency was 140 ± 1 cm- l in AgBr, and 197 ±l cm-1 in AgCl.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-08T15:54:08Z No. of bitstreams: 1 1967_brandt.pdf: 3434751 bytes, checksum: f18be66771f6dc5d523ea6c86f252c18 (MD5)","Made available in DSpace on 2011-07-08T15:54:08Z (GMT). No. of bitstreams: 1 1967_brandt.pdf: 3434751 bytes, checksum: f18be66771f6dc5d523ea6c86f252c18 (MD5) Previous issue date: 1967","Restriction data tranferred 2014-07-01T11:32:45-05:00 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 2011-07-08T15:54:09Z Item is restricted indefinitely.","Thesis","U of I Only"],"dc:identifier":["6090090","http://hdl.handle.net/2142/25716"],"dc:language":["en"],"dc:rights":["1967 Richard Charles Brandt"],"dc:subject":["infrared absorption","localized polarons","silver halides","silver halide crystals"],"dc:title":["Infrared absorption by localized polarons in the silver halides"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:26Z"}