{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25529"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25529","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Surface enhanced Ramam scattering studies in ultrahigh vacuum","abstract":"We have observed Raman scattering signals from carbon monoxide adsorbed on silver films deposited on a 120 K substrate that are approximately 5 orders of magnitude stronger than would be expected from the known cross section. These studies were performed in an ultrahigh vacuum chamber. This enhancement is similar to that observed off silver electroue5 in electrochemical cells. The enhancement is destroyed by room temperature annealing of bur films, so we infer that the surface roughness inherent in our evaporation process is essential to the enhancement mechanism. This, along with the fact that enhancement is observed for such a weakly bound system, suggests that many of the proposed mechanisms of Raman enhancement do not properly describe the observed phenomena. We have also observed enhanced Raman scattering from CO adsorbed on evaporated gold films, although the enhancement is approximately 300 times weaker than it is for silver. The dependence of the enhanced signals on laser wavelength for CO adsorbed on silver and gold was studied. For silver, the enhancemen was stronger at the blue end of the spectrum than at the red end, and the opposite result was found for gold. The result for silver is contrary to results obtained by several other groups in elcctrochemical cells. Single crystal silver (Ill) films grown epitaxially on mica in situ and polycrystalline aluminum films deposited on cooled substrates both showed bands at 1360 and 1590 cm-1 before intentional exposure to adsorbates. The origin of these bands was not firmly established.","abstract_html":"We have observed Raman scattering signals from carbon monoxide adsorbed on silver films deposited on a 120 K substrate that are approximately 5 orders of magnitude stronger than would be expected from the known cross section. These studies were performed in an ultrahigh vacuum chamber. This enhancement is similar to that observed off silver electroue5 in electrochemical cells. The enhancement is destroyed by room temperature annealing of bur films, so we infer that the surface roughness inherent in our evaporation process is essential to the enhancement mechanism. This, along with the fact that enhancement is observed for such a weakly bound system, suggests that many of the proposed mechanisms of Raman enhancement do not properly describe the observed phenomena. We have also observed enhanced Raman scattering from CO adsorbed on evaporated gold films, although the enhancement is approximately 300 times weaker than it is for silver. The dependence of the enhanced signals on laser wavelength for CO adsorbed on silver and gold was studied. For silver, the enhancemen was stronger at the blue end of the spectrum than at the red end, and the opposite result was found for gold. The result for silver is contrary to results obtained by several other groups in elcctrochemical cells. Single crystal silver (Ill) films grown epitaxially on mica in situ and polycrystalline aluminum films deposited on cooled substrates both showed bands at 1360 and 1590 cm-1 before intentional exposure to adsorbates. The origin of these bands was not firmly established.","abstract_has_math":false,"creators":["Wood, Thomas Huntington"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Klein, Miles V."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-06-27T14:57:53Z","date_published":"2011-06-27T14:57:53Z","updated_at":"2026-07-22T22:25:24Z","subjects":["surface enhanced Raman scattering","Raman scattering","ultrahigh vacuum","carbon monoxide adsorbed on silver films"],"languages":["en"],"rights":["1980 Thomas Huntington Wood"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["452682"],"render_values":[{"text":"452682","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25529","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Klein, Miles V."]},{"key":"dc:creator","label":"Author","values":["Wood, Thomas Huntington"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-06-27T14:57:53Z","10000-01-01","1980"]},{"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":["surface enhanced Raman scattering","Raman scattering","ultrahigh vacuum","carbon monoxide adsorbed on silver films"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1980 Thomas Huntington Wood"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["452682","http://hdl.handle.net/2142/25529"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["We have observed Raman scattering signals from carbon monoxide adsorbed on silver films deposited on a 120 K substrate that are approximately 5 orders of magnitude stronger than would be expected from the known cross section. These studies were performed in an ultrahigh vacuum chamber. This enhancement is similar to that observed off silver electroue5 in electrochemical cells. The enhancement is destroyed by room temperature annealing of bur films, so we infer that the surface roughness inherent in our evaporation process is essential to the enhancement mechanism. This, along with the fact that enhancement is observed for such a weakly bound system, suggests that many of the proposed mechanisms of Raman enhancement do not properly describe the observed phenomena. We have also observed enhanced Raman scattering from CO adsorbed on evaporated gold films, although the enhancement is approximately 300 times weaker than it is for silver. The dependence of the enhanced signals on laser wavelength for CO adsorbed on silver and gold was studied. For silver, the enhancemen was stronger at the blue end of the spectrum than at the red end, and the opposite result was found for gold. The result for silver is contrary to results obtained by several other groups in elcctrochemical cells. Single crystal silver (Ill) films grown epitaxially on mica in situ and polycrystalline aluminum films deposited on cooled substrates both showed bands at 1360 and 1590 cm-1 before intentional exposure to adsorbates. The origin of these bands was not firmly established.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-27T14:57:53Z No. of bitstreams: 1 1980_wood.pdf: 3409807 bytes, checksum: ee24b195012e0ff131c9bfbba193d0f9 (MD5)","Made available in DSpace on 2011-06-27T14:57:53Z (GMT). No. of bitstreams: 1 1980_wood.pdf: 3409807 bytes, checksum: ee24b195012e0ff131c9bfbba193d0f9 (MD5) Previous issue date: 1980","Restriction data tranferred 2014-07-01T11:32:22-05:00 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 2011-06-27T14:57:53Z Item is restricted indefinitely.","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Surface enhanced Ramam scattering studies in ultrahigh vacuum"]}]}],"canonical_facts":{"dc:contributor":["Klein, Miles V."],"dc:creator":["Wood, Thomas Huntington"],"dc:date":["2011-06-27T14:57:53Z","10000-01-01","1980"],"dc:description":["We have observed Raman scattering signals from carbon monoxide adsorbed on silver films deposited on a 120 K substrate that are approximately 5 orders of magnitude stronger than would be expected from the known cross section. These studies were performed in an ultrahigh vacuum chamber. This enhancement is similar to that observed off silver electroue5 in electrochemical cells. The enhancement is destroyed by room temperature annealing of bur films, so we infer that the surface roughness inherent in our evaporation process is essential to the enhancement mechanism. This, along with the fact that enhancement is observed for such a weakly bound system, suggests that many of the proposed mechanisms of Raman enhancement do not properly describe the observed phenomena. We have also observed enhanced Raman scattering from CO adsorbed on evaporated gold films, although the enhancement is approximately 300 times weaker than it is for silver. The dependence of the enhanced signals on laser wavelength for CO adsorbed on silver and gold was studied. For silver, the enhancemen was stronger at the blue end of the spectrum than at the red end, and the opposite result was found for gold. The result for silver is contrary to results obtained by several other groups in elcctrochemical cells. Single crystal silver (Ill) films grown epitaxially on mica in situ and polycrystalline aluminum films deposited on cooled substrates both showed bands at 1360 and 1590 cm-1 before intentional exposure to adsorbates. The origin of these bands was not firmly established.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-27T14:57:53Z No. of bitstreams: 1 1980_wood.pdf: 3409807 bytes, checksum: ee24b195012e0ff131c9bfbba193d0f9 (MD5)","Made available in DSpace on 2011-06-27T14:57:53Z (GMT). No. of bitstreams: 1 1980_wood.pdf: 3409807 bytes, checksum: ee24b195012e0ff131c9bfbba193d0f9 (MD5) Previous issue date: 1980","Restriction data tranferred 2014-07-01T11:32:22-05:00 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 2011-06-27T14:57:53Z Item is restricted indefinitely.","Thesis","U of I Only"],"dc:identifier":["452682","http://hdl.handle.net/2142/25529"],"dc:language":["en"],"dc:rights":["1980 Thomas Huntington Wood"],"dc:subject":["surface enhanced Raman scattering","Raman scattering","ultrahigh vacuum","carbon monoxide adsorbed on silver films"],"dc:title":["Surface enhanced Ramam scattering studies in ultrahigh vacuum"],"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"}