A polarized helium ion beam for surface electronic structure studies

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dc.contributor.advisorWalters, G. Kingen_US
dc.contributor.committeeMemberDunning, F. Barryen_US
dc.contributor.committeeMemberRorschach, Harold E.en_US
dc.creatorHarrison, Allen Rayen_US
dc.date.accessioned2018-12-18T21:15:57Zen_US
dc.date.available2018-12-18T21:15:57Zen_US
dc.date.issued1980en_US
dc.descriptionNo page 13, 116en_US
dc.description.abstractThis thesis describes the development of a spinpolarized He+ ion beam suitable for use as a- probe of surface electronic structure of metals. The method would represent an extension of ion neutralization spectroscopy (INS), and should provide new information on surface magnetism, electron correlation effects, and the dynamics of the ion neutralization process. Production of the polarized helium ion beam involves optically pumping helium metastable atoms in an rf electric discharge with subsequent extraction of ions created by metastable-metastable collisions. The principles of this technique and details of the experimental apparatus are presented. Ion currents of up to 1~ A were attained and optical pumping absorption measurements suggest a beam polarization of 8 to 1%. For a moderately low beam energy, about 15 eV, an ion density at the target surface of roughly 2 X 1 A-cm- with an energy spread of about 3 eV was attained. A specific experiment is proposed in which the polarized He+ beam would be used to probe the surface magnetic properties of nickel.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent152 ppen_US
dc.identifier.callnoThesis Phys. 1980 Harrisonen_US
dc.identifier.citationHarrison, Allen Ray. "A polarized helium ion beam for surface electronic structure studies." (1980) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/103989">https://hdl.handle.net/1911/103989</a>.en_US
dc.identifier.digitalRICE1615en_US
dc.identifier.urihttps://hdl.handle.net/1911/103989en_US
dc.language.isoengen_US
dc.rightsCopyright 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.en_US
dc.titleA polarized helium ion beam for surface electronic structure studiesen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentPhysicsen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Artsen_US
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