AN ELECTRON SPIN POLARIZED HELIUM-EXCITED(TRIPLET-2S) METASTABLE BEAM FOR USE IN SURFACE STUDIES

dc.creatorRIDDLE, THOMAS WAYNEen_US
dc.date.accessioned2007-05-09T19:31:09Zen_US
dc.date.available2007-05-09T19:31:09Zen_US
dc.date.issued1982en_US
dc.description.abstractA source of electron spin polarized He*(2('3)S) metastable atoms is described that provides a thermal energy beam with a flux up to 8 x 10('12) metastables/sec/sterad at a polarization P(,z) (TURN) 50%. The polarization is created by optical pumping and can be simply reversed or modulated without changing the beam trajectory or flux. The source is housed in a system of three differentially pumped vacuum chambers which allows the beam to be used for surface experiments in an ultra high vacuum environment. The polarization is measured with a Stern-Gerlach type analyzer which also serves as a useful diagnostic of beam composition and verifies the purity of the 2('3)S beam. The beam is demonstrated not to contain any significant admixture of 2('1)S metastables, ions, fast neutrals, or photons. Unless care is exercised, however, it is possible to produce a beam of energetic ground state helium which is of much greater intensity than the metastable beam. The conditions under which this occurs are described. A brief overview of metastable deexcitation spectroscopy (MDS) is given and a proposed first experiment involving the investigation of surface magnetism of Ni(110) and the necessary apparatus for this experiment are described.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoThesis Phys. 1982 Riddleen_US
dc.identifier.citationRIDDLE, THOMAS WAYNE. "AN ELECTRON SPIN POLARIZED HELIUM-EXCITED(TRIPLET-2S) METASTABLE BEAM FOR USE IN SURFACE STUDIES." (1982) Diss., Rice University. <a href="https://hdl.handle.net/1911/15719">https://hdl.handle.net/1911/15719</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/15719en_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.subjectCondensed matter physicsen_US
dc.titleAN ELECTRON SPIN POLARIZED HELIUM-EXCITED(TRIPLET-2S) METASTABLE BEAM FOR USE IN SURFACE 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.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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