Absolute differential cross-sections for keV energy ion and atom collisions with oxygen atoms

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dc.contributor.advisorStebbings, R. F.en_US
dc.creatorHakes, Charles Lynnen_US
dc.date.accessioned2009-06-04T00:22:04Zen_US
dc.date.available2009-06-04T00:22:04Zen_US
dc.date.issued1990en_US
dc.description.abstractOxygen atoms are the most abundant constituent in the Earth's atmosphere between 200km and 600km, and thus are the most probable targets for precipitating ions and atoms at these altitudes. Differential cross sections for collisions involving oxygen atoms supply information necessary for numerically modeling the conditions in the Earth's upper atmosphere. Absolute cross sections, differential in angle, for electron capture by 500, 1500, and 5000eV protons in collisions with oxygen atoms are presented. The target, a mixture of atomic and molecular oxygen produced in a microwave discharge, is confined to a very short ($<$1mm) teflon-coated cell. The abundance of atomic and molecular oxygen in the target is determined using an electron-impact-ionization time-of-flight-mass spectrometer. The mass spectrometer signal, yielding the atomic oxygen density in the target cell, is calibrated by comparing the direct scattering of He(500eV) + O to the direct scattering of O(2000eV) + He. The charge transfer cross sections are integrated and compared to total cross sections reported in the literature.en_US
dc.format.extent79 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoThesis Phys. 1990 Hakesen_US
dc.identifier.citationHakes, Charles Lynn. "Absolute differential cross-sections for keV energy ion and atom collisions with oxygen atoms." (1990) Diss., Rice University. <a href="https://hdl.handle.net/1911/16346">https://hdl.handle.net/1911/16346</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/16346en_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.subjectAtomic physicsen_US
dc.titleAbsolute differential cross-sections for keV energy ion and atom collisions with oxygen atomsen_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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