{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/18953"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/18953","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Multiphoton ionization photoelectron spectroscopy of iodine-bearing molecules","abstract":"Multiphoton ionization of iodine-bearing molecules has been studied, under collision-free conditions, by observing the kinetic energy of the ejected photoelectrons. These experiments have demonstrated that, for photoionization of I$\\sb2$, CF$\\sb3$I and HI at 532 nm, the scission of the R-I bond (R=I, CF$\\sb3$, HI) is favored over direct ionization of the molecule at intensities in the range of 10$\\sp{12}$-10$\\sp{13}$W/cm$\\sp2$. For the parent molecules studied, we have observed that the atomic iodine photofragment is predominantly formed in the $\\sp2$P$\\sb{3/2}$ and $\\sp2$P$\\sb{1/2}$ spin-orbit terms of the atomic iodine ground state. Subsequent 5-photon ionization at 532 nm from the $\\sp2$P$\\sb{3/2}$ and $\\sp2$P$\\sb{1/2}$ ground states of the fragment preferably produces ions in the $\\sp3$P$\\sb2$ and $\\sp3$P$\\sb1$ levels of the ion ground state. These results are consistent with production of the atomic iodine fragment prior to ionization of the parent molecule. Above-threshold ionization is observed for atomic iodine excited from both the $\\sp2$P$\\sb{3/2}$ and $\\sp2$P$\\sb{1/2}$ ground states.","abstract_html":"Multiphoton ionization of iodine-bearing molecules has been studied, under collision-free conditions, by observing the kinetic energy of the ejected photoelectrons. These experiments have demonstrated that, for photoionization of I$\\sb2$, CF$\\sb3$I and HI at 532 nm, the scission of the R-I bond (R=I, CF$\\sb3$, HI) is favored over direct ionization of the molecule at intensities in the range of 10$\\sp{12}$-10$\\sp{13}$W/cm$\\sp2$. For the parent molecules studied, we have observed that the atomic iodine photofragment is predominantly formed in the $\\sp2$P$\\sb{3/2}$ and $\\sp2$P$\\sb{1/2}$ spin-orbit terms of the atomic iodine ground state. Subsequent 5-photon ionization at 532 nm from the $\\sp2$P$\\sb{3/2}$ and $\\sp2$P$\\sb{1/2}$ ground states of the fragment preferably produces ions in the $\\sp3$P$\\sb2$ and $\\sp3$P$\\sb1$ levels of the ion ground state. These results are consistent with production of the atomic iodine fragment prior to ionization of the parent molecule. Above-threshold ionization is observed for atomic iodine excited from both the $\\sp2$P$\\sb{3/2}$ and $\\sp2$P$\\sb{1/2}$ ground states.","abstract_has_math":true,"creators":["Zietkiewicz, Christopher John"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Electrical Engineering","degree_department":null,"school":null,"contributors":["Eden, James G."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T11:52:28Z","date_published":"2011-05-07T11:52:28Z","updated_at":"2026-07-22T22:25:12Z","subjects":["Physics, Molecular"],"languages":["eng"],"rights":["Copyright 1992 Zietkiewicz, Christopher John"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9215921","(UMI)AAI9215921"],"render_values":[{"text":"AAI9215921","href":null,"code":true},{"text":"(UMI)AAI9215921","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/18953","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Eden, James G."]},{"key":"dc:creator","label":"Author","values":["Zietkiewicz, Christopher John"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T11:52:28Z","10000-01-01","1992"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical Engineering"]},{"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, Molecular"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1992 Zietkiewicz, Christopher John"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9215921","(UMI)AAI9215921","http://hdl.handle.net/2142/18953"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Multiphoton ionization of iodine-bearing molecules has been studied, under collision-free conditions, by observing the kinetic energy of the ejected photoelectrons. These experiments have demonstrated that, for photoionization of I$\\sb2$, CF$\\sb3$I and HI at 532 nm, the scission of the R-I bond (R=I, CF$\\sb3$, HI) is favored over direct ionization of the molecule at intensities in the range of 10$\\sp{12}$-10$\\sp{13}$W/cm$\\sp2$. For the parent molecules studied, we have observed that the atomic iodine photofragment is predominantly formed in the $\\sp2$P$\\sb{3/2}$ and $\\sp2$P$\\sb{1/2}$ spin-orbit terms of the atomic iodine ground state. Subsequent 5-photon ionization at 532 nm from the $\\sp2$P$\\sb{3/2}$ and $\\sp2$P$\\sb{1/2}$ ground states of the fragment preferably produces ions in the $\\sp3$P$\\sb2$ and $\\sp3$P$\\sb1$ levels of the ion ground state. These results are consistent with production of the atomic iodine fragment prior to ionization of the parent molecule. Above-threshold ionization is observed for atomic iodine excited from both the $\\sp2$P$\\sb{3/2}$ and $\\sp2$P$\\sb{1/2}$ ground states.","Only weak evidence was found for molecular ionization of I$\\sb2$ at the extremes of intensities studied. For HI, however, the production of the v$\\sp\\prime$ = 0,1 levels of the $\\sp2\\Pi\\sb{1/2}$ state of the ion and the v$\\sp\\prime$ = 0,1,2,3,4 levels of the $\\sp2\\Pi\\sb{3/2}$ state of the molecule is reported.","Made available in DSpace on 2011-05-07T11:52:28Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9215921.pdf: 2988324 bytes, checksum: 9a0e56782bf67227d5a56a5e647cff45 (MD5) Previous issue date: 1992","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:33:39Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:12:30-05:00 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":["Multiphoton ionization photoelectron spectroscopy of iodine-bearing molecules"]}]}],"canonical_facts":{"dc:contributor":["Eden, James G."],"dc:creator":["Zietkiewicz, Christopher John"],"dc:date":["2011-05-07T11:52:28Z","10000-01-01","1992"],"dc:description":["Multiphoton ionization of iodine-bearing molecules has been studied, under collision-free conditions, by observing the kinetic energy of the ejected photoelectrons. These experiments have demonstrated that, for photoionization of I$\\sb2$, CF$\\sb3$I and HI at 532 nm, the scission of the R-I bond (R=I, CF$\\sb3$, HI) is favored over direct ionization of the molecule at intensities in the range of 10$\\sp{12}$-10$\\sp{13}$W/cm$\\sp2$. For the parent molecules studied, we have observed that the atomic iodine photofragment is predominantly formed in the $\\sp2$P$\\sb{3/2}$ and $\\sp2$P$\\sb{1/2}$ spin-orbit terms of the atomic iodine ground state. Subsequent 5-photon ionization at 532 nm from the $\\sp2$P$\\sb{3/2}$ and $\\sp2$P$\\sb{1/2}$ ground states of the fragment preferably produces ions in the $\\sp3$P$\\sb2$ and $\\sp3$P$\\sb1$ levels of the ion ground state. These results are consistent with production of the atomic iodine fragment prior to ionization of the parent molecule. Above-threshold ionization is observed for atomic iodine excited from both the $\\sp2$P$\\sb{3/2}$ and $\\sp2$P$\\sb{1/2}$ ground states.","Only weak evidence was found for molecular ionization of I$\\sb2$ at the extremes of intensities studied. For HI, however, the production of the v$\\sp\\prime$ = 0,1 levels of the $\\sp2\\Pi\\sb{1/2}$ state of the ion and the v$\\sp\\prime$ = 0,1,2,3,4 levels of the $\\sp2\\Pi\\sb{3/2}$ state of the molecule is reported.","Made available in DSpace on 2011-05-07T11:52:28Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9215921.pdf: 2988324 bytes, checksum: 9a0e56782bf67227d5a56a5e647cff45 (MD5) Previous issue date: 1992","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:33:39Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:12:30-05:00 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":["AAI9215921","(UMI)AAI9215921","http://hdl.handle.net/2142/18953"],"dc:language":["eng"],"dc:rights":["Copyright 1992 Zietkiewicz, Christopher John"],"dc:subject":["Physics, Molecular"],"dc:title":["Multiphoton ionization photoelectron spectroscopy of iodine-bearing molecules"],"dc:type":["text"],"thesis:degree_discipline":["Electrical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:12Z"}