{"id":{"repo_id":"unr","oai_identifier":"oai:scholarwolf.unr.edu:11714/4054"},"canonical_url":"https://search.dev.ndltd.org/etd/unr/oai:scholarwolf.unr.edu:11714/4054","repository":{"repo_id":"unr","name":"University of Nevada - Reno","base_url":"https://scholarwolf.unr.edu/server/oai/request"},"display":{"title":"Photoionization of the Cerium Isonuclear Sequence and Cerium Endohedral Fullerene","abstract":"This dissertation presents an experimental photoionization study of the cerium isonuclear sequence ions in the energy range of the 4d inner-shell giant resonance. In addition, single and double photoionization and photofragmentation cross sections of the cerium endohedral ion Ce$@$C$_{82}^{+}$ were also measured and studied in the 4d excitation-ionization energy range of cerium.Relative and absolute cross-section measurements were performed at undulator beamline 10.0.1 of the Advanced Light Source (ALS) for nine parent cerium ions: Ce$^{+}$ -- Ce$^{9+}$. Double-to-single ionization cross-section ratios were measured for photoionization of the endohedral Ce$@$C$_{82}^{+}$ and empty fullerene C$_{82}^{+}$ molecular ions. The merged ion and photon beams technique was used to conduct the experiments. Multiconfiguration Hartree-Fock calculations were performed as an aid to interpret the experimental data. Four Rydberg series for 4d $\\rightarrow$ nf (n $\\geq$ 4) and 4d $\\rightarrow$ np (n $\\geq$ 6) autoionizing excitations were assigned using the quantum defect theory for the Ce$^{3+}$ photoionization cross section. The experimental data show the collapse of the nf wavefunctions (n $\\geq$ 4) with increasing ionization stage as outer-shell electrons are stripped from the parent ion. The nf orbital collapse occurs partially for Ce$^{2+}$ and Ce$^{3+}$ ion and completely for Ce$^{4+}$, where these wavefunctions penetrate the core region of the ion. A strong contribution to the total oscillator strength was observed in the double and triple photoionization channels for low charge states ( Ce$^{+}$, Ce$^{2+}$, and Ce$^{3+}$), whereas most of the 4d excitations of the higher charge states decay by ejection of one electron.","abstract_html":"This dissertation presents an experimental photoionization study of the cerium isonuclear sequence ions in the energy range of the 4d inner-shell giant resonance. In addition, single and double photoionization and photofragmentation cross sections of the cerium endohedral ion Ce$@$C<span class=\"etd-inline-math\"><sub>82</sub><sup>+</sup></span> were also measured and studied in the 4d excitation-ionization energy range of cerium.Relative and absolute cross-section measurements were performed at undulator beamline 10.0.1 of the Advanced Light Source (ALS) for nine parent cerium ions: Ce<span class=\"etd-inline-math\"><sup>+</sup></span> -- Ce<span class=\"etd-inline-math\"><sup>9+</sup></span>. Double-to-single ionization cross-section ratios were measured for photoionization of the endohedral Ce$@$C<span class=\"etd-inline-math\"><sub>82</sub><sup>+</sup></span> and empty fullerene C<span class=\"etd-inline-math\"><sub>82</sub><sup>+</sup></span> molecular ions. The merged ion and photon beams technique was used to conduct the experiments. Multiconfiguration Hartree-Fock calculations were performed as an aid to interpret the experimental data. Four Rydberg series for 4d $\\rightarrow$ nf (n $\\geq$ 4) and 4d $\\rightarrow$ np (n $\\geq$ 6) autoionizing excitations were assigned using the quantum defect theory for the Ce<span class=\"etd-inline-math\"><sup>3+</sup></span> photoionization cross section. The experimental data show the collapse of the nf wavefunctions (n $\\geq$ 4) with increasing ionization stage as outer-shell electrons are stripped from the parent ion. The nf orbital collapse occurs partially for Ce<span class=\"etd-inline-math\"><sup>2+</sup></span> and Ce<span class=\"etd-inline-math\"><sup>3+</sup></span> ion and completely for Ce<span class=\"etd-inline-math\"><sup>4+</sup></span>, where these wavefunctions penetrate the core region of the ion. A strong contribution to the total oscillator strength was observed in the double and triple photoionization channels for low charge states ( Ce<span class=\"etd-inline-math\"><sup>+</sup></span>, Ce<span class=\"etd-inline-math\"><sup>2+</sup></span>, and Ce<span class=\"etd-inline-math\"><sup>3+</sup></span>), whereas most of the 4d excitations of the higher charge states decay by ejection of one electron.","abstract_has_math":true,"creators":["Habibi, Mustapha"],"institution":null,"degree_name":null,"degree_level":"Doctorate Degree","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Phaneuf, Ronald A."],"committee_chairs":[],"committee_members":["Thompson, Jefferey S.","Winkler, Peter","Neill, Paul","Fadali, Mohamed S."],"year":2009,"date_issued":"2009","date_published":"2009","updated_at":"2026-07-27T21:47:47Z","subjects":["Cerium","endohedral fullerene","photofragmentation","Photoionization"],"languages":[],"rights":["In Copyright(All Rights Reserved)"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11714/4054","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Phaneuf, Ronald A."]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Thompson, Jefferey S.","Winkler, Peter","Neill, Paul","Fadali, Mohamed S."]},{"key":"dc:creator","label":"Author","values":["Habibi, Mustapha"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2018-09-06T17:19:56Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2018-09-06T17:19:56Z"]},{"key":"dc:date.issued","label":"Date","values":["2009"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Doctorate Degree"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Cerium","endohedral fullerene","photofragmentation","Photoionization"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["In Copyright(All Rights Reserved)"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11714/4054"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This dissertation presents an experimental photoionization study of the cerium isonuclear sequence ions in the energy range of the 4d inner-shell giant resonance. In addition, single and double photoionization and photofragmentation cross sections of the cerium endohedral ion Ce$@$C$_{82}^{+}$ were also measured and studied in the 4d excitation-ionization energy range of cerium.Relative and absolute cross-section measurements were performed at undulator beamline 10.0.1 of the Advanced Light Source (ALS) for nine parent cerium ions: Ce$^{+}$ -- Ce$^{9+}$. Double-to-single ionization cross-section ratios were measured for photoionization of the endohedral Ce$@$C$_{82}^{+}$ and empty fullerene C$_{82}^{+}$ molecular ions. The merged ion and photon beams technique was used to conduct the experiments. Multiconfiguration Hartree-Fock calculations were performed as an aid to interpret the experimental data. Four Rydberg series for 4d $\\rightarrow$ nf (n $\\geq$ 4) and 4d $\\rightarrow$ np (n $\\geq$ 6) autoionizing excitations were assigned using the quantum defect theory for the Ce$^{3+}$ photoionization cross section. The experimental data show the collapse of the nf wavefunctions (n $\\geq$ 4) with increasing ionization stage as outer-shell electrons are stripped from the parent ion. The nf orbital collapse occurs partially for Ce$^{2+}$ and Ce$^{3+}$ ion and completely for Ce$^{4+}$, where these wavefunctions penetrate the core region of the ion. A strong contribution to the total oscillator strength was observed in the double and triple photoionization channels for low charge states ( Ce$^{+}$, Ce$^{2+}$, and Ce$^{3+}$), whereas most of the 4d excitations of the higher charge states decay by ejection of one electron."]},{"key":"dc:format","label":"Dc Format","values":["PDF"]},{"key":"dc:title","label":"Title","values":["Photoionization of the Cerium Isonuclear Sequence and Cerium Endohedral Fullerene"]}]}],"canonical_facts":{"dc:contributor.advisor":["Phaneuf, Ronald A."],"dc:contributor.committeemember":["Thompson, Jefferey S.","Winkler, Peter","Neill, Paul","Fadali, Mohamed S."],"dc:creator":["Habibi, Mustapha"],"dc:date.accessioned":["2018-09-06T17:19:56Z"],"dc:date.available":["2018-09-06T17:19:56Z"],"dc:date.issued":["2009"],"dc:description.abstract":["This dissertation presents an experimental photoionization study of the cerium isonuclear sequence ions in the energy range of the 4d inner-shell giant resonance. In addition, single and double photoionization and photofragmentation cross sections of the cerium endohedral ion Ce$@$C$_{82}^{+}$ were also measured and studied in the 4d excitation-ionization energy range of cerium.Relative and absolute cross-section measurements were performed at undulator beamline 10.0.1 of the Advanced Light Source (ALS) for nine parent cerium ions: Ce$^{+}$ -- Ce$^{9+}$. Double-to-single ionization cross-section ratios were measured for photoionization of the endohedral Ce$@$C$_{82}^{+}$ and empty fullerene C$_{82}^{+}$ molecular ions. The merged ion and photon beams technique was used to conduct the experiments. Multiconfiguration Hartree-Fock calculations were performed as an aid to interpret the experimental data. Four Rydberg series for 4d $\\rightarrow$ nf (n $\\geq$ 4) and 4d $\\rightarrow$ np (n $\\geq$ 6) autoionizing excitations were assigned using the quantum defect theory for the Ce$^{3+}$ photoionization cross section. The experimental data show the collapse of the nf wavefunctions (n $\\geq$ 4) with increasing ionization stage as outer-shell electrons are stripped from the parent ion. The nf orbital collapse occurs partially for Ce$^{2+}$ and Ce$^{3+}$ ion and completely for Ce$^{4+}$, where these wavefunctions penetrate the core region of the ion. A strong contribution to the total oscillator strength was observed in the double and triple photoionization channels for low charge states ( Ce$^{+}$, Ce$^{2+}$, and Ce$^{3+}$), whereas most of the 4d excitations of the higher charge states decay by ejection of one electron."],"dc:format":["PDF"],"dc:identifier.uri":["http://hdl.handle.net/11714/4054"],"dc:rights":["In Copyright(All Rights Reserved)"],"dc:subject":["Cerium","endohedral fullerene","photofragmentation","Photoionization"],"dc:title":["Photoionization of the Cerium Isonuclear Sequence and Cerium Endohedral Fullerene"],"dc:type":["Dissertation"],"thesis:degree_level":["Doctorate Degree"]},"updated_at":"2026-07-27T21:47:47Z"}