{"id":{"repo_id":"rice","oai_identifier":"oai:repository.rice.edu:1911/13961"},"canonical_url":"https://search.dev.ndltd.org/etd/rice/oai:repository.rice.edu:1911/13961","repository":{"repo_id":"rice","name":"Rice University","base_url":"https://repository.rice.edu/server/oai/request"},"display":{"title":"Developing a spin polarized helium ion source for surface electronic structure studies","abstract":"Development of a low energy spin polarized He$\\sp+$ source for application in studies of electron spin correlations in ion neutralization at surfaces is described. The source is based on an optically pumped helium discharge. An rf discharge is used to produce metastable helium atoms in a clean pyrex glass cell. A 300 mW Ti:sapphire laser operating at 1.083 $\\mu$m is used to optically pump the He(2$\\sp3$S) atoms on the $\\rm 2\\sp3S\\sb1\\leftrightarrow 2\\sp3P\\sb1\\ (D\\sb1)$ transition to preferentially populate the $\\rm He(2\\sp3S)\\ M\\sb{j}(M\\sb{s}) = +1\\ or\\ -1$ magnetic sublevels. The electron spin polarization of the resulting atoms is measured using optical absorption. He(2$\\sp3$S) polarizations of $\\sim$60-70% can be routinely achieved. He$\\sp+$ ions, which are produced in metastable-metastable collisions and therefore are expected to be polarized, are extracted from the discharge cell and are focused using a system of ion optics. The ion energy spread is large, $\\sim$30-40 eV, but can be reduced to $\\sim$3-4 eV by energy filtering. The resulting ion current, $\\sim$0.5 nA, is sufficient to study spin dependences in a variety of ion-surface interactions.","abstract_html":"Development of a low energy spin polarized He$\\sp+$ source for application in studies of electron spin correlations in ion neutralization at surfaces is described. The source is based on an optically pumped helium discharge. An rf discharge is used to produce metastable helium atoms in a clean pyrex glass cell. A 300 mW Ti:sapphire laser operating at 1.083 <span class=\"etd-inline-math\">&mu;</span>m is used to optically pump the He(2$\\sp3$S) atoms on the <span class=\"etd-inline-math\">\\rm 2\\sp3S\\sb1\\leftrightarrow 2\\sp3P\\sb1 (D\\sb1)</span> transition to preferentially populate the <span class=\"etd-inline-math\">\\rm He(2\\sp3S) M\\sb{j}(M\\sb{s}) = +1 or -1</span> magnetic sublevels. The electron spin polarization of the resulting atoms is measured using optical absorption. He(2$\\sp3$S) polarizations of $\\sim$60-70% can be routinely achieved. He$\\sp+$ ions, which are produced in metastable-metastable collisions and therefore are expected to be polarized, are extracted from the discharge cell and are focused using a system of ion optics. The ion energy spread is large, $\\sim$30-40 eV, but can be reduced to $\\sim$3-4 eV by energy filtering. The resulting ion current, $\\sim$0.5 nA, is sufficient to study spin dependences in a variety of ion-surface interactions.","abstract_has_math":true,"creators":["Huang, Dajin"],"institution":"Rice University","degree_name":"Master of Science","degree_level":"Masters","degree_discipline":"Natural Sciences","degree_department":null,"school":null,"contributors":[],"advisors":["Dunning, F. B."],"committee_chairs":[],"committee_members":[],"year":1995,"date_issued":"1995","date_published":"1995","updated_at":"2026-07-24T04:10:37Z","subjects":["Atomic physics"],"languages":["eng"],"rights":["Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1911/13961","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Dunning, F. B."]},{"key":"dc:creator","label":"Author","values":["Huang, Dajin"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2009-06-04T00:08:05Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2009-06-04T00:08:05Z"]},{"key":"dc:date.issued","label":"Date","values":["1995"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Natural Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Rice University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Atomic physics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1911/13961"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Development of a low energy spin polarized He$\\sp+$ source for application in studies of electron spin correlations in ion neutralization at surfaces is described. The source is based on an optically pumped helium discharge. An rf discharge is used to produce metastable helium atoms in a clean pyrex glass cell. A 300 mW Ti:sapphire laser operating at 1.083 $\\mu$m is used to optically pump the He(2$\\sp3$S) atoms on the $\\rm 2\\sp3S\\sb1\\leftrightarrow 2\\sp3P\\sb1\\ (D\\sb1)$ transition to preferentially populate the $\\rm He(2\\sp3S)\\ M\\sb{j}(M\\sb{s}) = +1\\ or\\ -1$ magnetic sublevels. The electron spin polarization of the resulting atoms is measured using optical absorption. He(2$\\sp3$S) polarizations of $\\sim$60-70% can be routinely achieved. He$\\sp+$ ions, which are produced in metastable-metastable collisions and therefore are expected to be polarized, are extracted from the discharge cell and are focused using a system of ion optics. The ion energy spread is large, $\\sim$30-40 eV, but can be reduced to $\\sim$3-4 eV by energy filtering. The resulting ion current, $\\sim$0.5 nA, is sufficient to study spin dependences in a variety of ion-surface interactions."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Developing a spin polarized helium ion source for surface electronic structure studies"]}]}],"canonical_facts":{"dc:contributor.advisor":["Dunning, F. B."],"dc:creator":["Huang, Dajin"],"dc:date.accessioned":["2009-06-04T00:08:05Z"],"dc:date.available":["2009-06-04T00:08:05Z"],"dc:date.issued":["1995"],"dc:description.abstract":["Development of a low energy spin polarized He$\\sp+$ source for application in studies of electron spin correlations in ion neutralization at surfaces is described. The source is based on an optically pumped helium discharge. An rf discharge is used to produce metastable helium atoms in a clean pyrex glass cell. A 300 mW Ti:sapphire laser operating at 1.083 $\\mu$m is used to optically pump the He(2$\\sp3$S) atoms on the $\\rm 2\\sp3S\\sb1\\leftrightarrow 2\\sp3P\\sb1\\ (D\\sb1)$ transition to preferentially populate the $\\rm He(2\\sp3S)\\ M\\sb{j}(M\\sb{s}) = +1\\ or\\ -1$ magnetic sublevels. The electron spin polarization of the resulting atoms is measured using optical absorption. He(2$\\sp3$S) polarizations of $\\sim$60-70% can be routinely achieved. He$\\sp+$ ions, which are produced in metastable-metastable collisions and therefore are expected to be polarized, are extracted from the discharge cell and are focused using a system of ion optics. The ion energy spread is large, $\\sim$30-40 eV, but can be reduced to $\\sim$3-4 eV by energy filtering. The resulting ion current, $\\sim$0.5 nA, is sufficient to study spin dependences in a variety of ion-surface interactions."],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["https://hdl.handle.net/1911/13961"],"dc:language.iso":["eng"],"dc:rights":["Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder."],"dc:subject":["Atomic physics"],"dc:title":["Developing a spin polarized helium ion source for surface electronic structure studies"],"dc:type":["Thesis"],"thesis:degree_discipline":["Natural Sciences"],"thesis:degree_level":["Masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Rice University"]},"updated_at":"2026-07-24T04:10:37Z"}