{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/20103"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/20103","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Multiphoton ionization of hydrogen iodide and molecular iodine using photoelectron spectroscopy","abstract":"Hydrogen iodide and I$\\sb2$ molecules were studied by time-of-flight photoelectron spectroscopy using multiphoton ionization techniques. At a pumping wavelength of 532 nm, it was concluded that dissociation due to the intermediate repulsive valence states is very strong for both HI and I$\\sb2.$ For HI, the dissociative valence states correlate with H($\\sp1$S) + I($\\sp2$P$\\sb{3/2,1/2});$ And for I$\\sb2,$ they correlate with I($\\sp2$P$\\sb{3/2,1/2})$ + I($\\sp2$P$\\sb{3/2,1/2}).$ As a result, ionization from the ground states of spin-orbit doublets $(\\sp2$P$\\sb{3/2,1/2})$ of atomic iodine is predominant in the photoelectron spectra. In contrast, photoionization of HI at 355 nm is direct, owing to the absence of the dissociative valence states. Vibrationally resolved spectra were observed for both of the spin-orbit doublets of the HI$\\sp+$ ground state (v$\\sp+$ = 10 for $\\sp2\\Pi\\sb{3/2}$ and v$\\sp+$ = 6 for $\\sp2\\Pi\\sb{1/2})$ and the vibrational constants and anharmonicities were extracted from the data. Tunable laser experiments (567-578 nm) showed a new Rydberg series of I$\\sb2$ converging to the excited state of $\\rm I\\sbsp{2}{+}(\\sp2\\Sigma\\sb{3/2\\rm u}).$","abstract_html":"Hydrogen iodide and I$\\sb2$ molecules were studied by time-of-flight photoelectron spectroscopy using multiphoton ionization techniques. At a pumping wavelength of 532 nm, it was concluded that dissociation due to the intermediate repulsive valence states is very strong for both HI and I$\\sb2.$ For HI, the dissociative valence states correlate with H($\\sp1$S) + I($\\sp2$P$\\sb{3/2,1/2});$ And for I$\\sb2,$ they correlate with I($\\sp2$P$\\sb{3/2,1/2})$ + I($\\sp2$P$\\sb{3/2,1/2}).$ As a result, ionization from the ground states of spin-orbit doublets $(\\sp2$P$\\sb{3/2,1/2})$ of atomic iodine is predominant in the photoelectron spectra. In contrast, photoionization of HI at 355 nm is direct, owing to the absence of the dissociative valence states. Vibrationally resolved spectra were observed for both of the spin-orbit doublets of the HI$\\sp+$ ground state (v$\\sp+$ = 10 for $\\sp2\\Pi\\sb{3/2}$ and v$\\sp+$ = 6 for $\\sp2\\Pi\\sb{1/2})$ and the vibrational constants and anharmonicities were extracted from the data. Tunable laser experiments (567-578 nm) showed a new Rydberg series of I$\\sb2$ converging to the excited state of $\\rm I\\sbsp{2}{+}(\\sp2\\Sigma\\sb{3/2\\rm u}).$","abstract_has_math":true,"creators":["Gu, Yiyun"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Electrical and Computer Engineering","degree_department":null,"school":null,"contributors":["Eden, James G."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:28:52Z","date_published":"2011-05-07T12:28:52Z","updated_at":"2026-07-22T22:25:15Z","subjects":["Engineering, Electronics and Electrical"],"languages":["eng"],"rights":["Copyright 1993 Gu, Yiyun"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9329048","(UMI)AAI9329048"],"render_values":[{"text":"AAI9329048","href":null,"code":true},{"text":"(UMI)AAI9329048","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/20103","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":["Gu, Yiyun"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:28:52Z","10000-01-01","1993"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical and Computer 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":["Engineering, Electronics and Electrical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1993 Gu, Yiyun"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9329048","(UMI)AAI9329048","http://hdl.handle.net/2142/20103"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Hydrogen iodide and I$\\sb2$ molecules were studied by time-of-flight photoelectron spectroscopy using multiphoton ionization techniques. At a pumping wavelength of 532 nm, it was concluded that dissociation due to the intermediate repulsive valence states is very strong for both HI and I$\\sb2.$ For HI, the dissociative valence states correlate with H($\\sp1$S) + I($\\sp2$P$\\sb{3/2,1/2});$ And for I$\\sb2,$ they correlate with I($\\sp2$P$\\sb{3/2,1/2})$ + I($\\sp2$P$\\sb{3/2,1/2}).$ As a result, ionization from the ground states of spin-orbit doublets $(\\sp2$P$\\sb{3/2,1/2})$ of atomic iodine is predominant in the photoelectron spectra. In contrast, photoionization of HI at 355 nm is direct, owing to the absence of the dissociative valence states. Vibrationally resolved spectra were observed for both of the spin-orbit doublets of the HI$\\sp+$ ground state (v$\\sp+$ = 10 for $\\sp2\\Pi\\sb{3/2}$ and v$\\sp+$ = 6 for $\\sp2\\Pi\\sb{1/2})$ and the vibrational constants and anharmonicities were extracted from the data. Tunable laser experiments (567-578 nm) showed a new Rydberg series of I$\\sb2$ converging to the excited state of $\\rm I\\sbsp{2}{+}(\\sp2\\Sigma\\sb{3/2\\rm u}).$","At laser intensities of ${\\sim}10\\sp{13}$ W/cm$\\sp2$ and a driving wavelength of 532 nm or 355 nm, above-threshold ionization (ATI) was observed. Because of the strong dissociation at 532 nm for both HI and I$\\sb2$, only ATI of atomic iodine was observed. With the 355 nm laser, ATI of HI was observed. Above threshold ionization of I$\\sb2$ was also observed at 579.5 nm at laser intensities exceeding ${\\sim}10\\sp{11}$ W/cm$\\sp2$.","Made available in DSpace on 2011-05-07T12:28:52Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9329048.pdf: 2688227 bytes, checksum: 2bd79542ed416bda84ca5429596028c1 (MD5) Previous issue date: 1993","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:41:35Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:18:00-05:00 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 of hydrogen iodide and molecular iodine using photoelectron spectroscopy"]}]}],"canonical_facts":{"dc:contributor":["Eden, James G."],"dc:creator":["Gu, Yiyun"],"dc:date":["2011-05-07T12:28:52Z","10000-01-01","1993"],"dc:description":["Hydrogen iodide and I$\\sb2$ molecules were studied by time-of-flight photoelectron spectroscopy using multiphoton ionization techniques. At a pumping wavelength of 532 nm, it was concluded that dissociation due to the intermediate repulsive valence states is very strong for both HI and I$\\sb2.$ For HI, the dissociative valence states correlate with H($\\sp1$S) + I($\\sp2$P$\\sb{3/2,1/2});$ And for I$\\sb2,$ they correlate with I($\\sp2$P$\\sb{3/2,1/2})$ + I($\\sp2$P$\\sb{3/2,1/2}).$ As a result, ionization from the ground states of spin-orbit doublets $(\\sp2$P$\\sb{3/2,1/2})$ of atomic iodine is predominant in the photoelectron spectra. In contrast, photoionization of HI at 355 nm is direct, owing to the absence of the dissociative valence states. Vibrationally resolved spectra were observed for both of the spin-orbit doublets of the HI$\\sp+$ ground state (v$\\sp+$ = 10 for $\\sp2\\Pi\\sb{3/2}$ and v$\\sp+$ = 6 for $\\sp2\\Pi\\sb{1/2})$ and the vibrational constants and anharmonicities were extracted from the data. Tunable laser experiments (567-578 nm) showed a new Rydberg series of I$\\sb2$ converging to the excited state of $\\rm I\\sbsp{2}{+}(\\sp2\\Sigma\\sb{3/2\\rm u}).$","At laser intensities of ${\\sim}10\\sp{13}$ W/cm$\\sp2$ and a driving wavelength of 532 nm or 355 nm, above-threshold ionization (ATI) was observed. Because of the strong dissociation at 532 nm for both HI and I$\\sb2$, only ATI of atomic iodine was observed. With the 355 nm laser, ATI of HI was observed. Above threshold ionization of I$\\sb2$ was also observed at 579.5 nm at laser intensities exceeding ${\\sim}10\\sp{11}$ W/cm$\\sp2$.","Made available in DSpace on 2011-05-07T12:28:52Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9329048.pdf: 2688227 bytes, checksum: 2bd79542ed416bda84ca5429596028c1 (MD5) Previous issue date: 1993","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:41:35Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:18:00-05:00 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":["AAI9329048","(UMI)AAI9329048","http://hdl.handle.net/2142/20103"],"dc:language":["eng"],"dc:rights":["Copyright 1993 Gu, Yiyun"],"dc:subject":["Engineering, Electronics and Electrical"],"dc:title":["Multiphoton ionization of hydrogen iodide and molecular iodine using photoelectron spectroscopy"],"dc:type":["text"],"thesis:degree_discipline":["Electrical and Computer Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:15Z"}