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dc.contributor.advisor Walters, G. King
dc.creatorO'Neill, Malcolm Ross, 1940-
dc.date.accessioned 2016-04-21T12:01:33Z
dc.date.available 2016-04-21T12:01:33Z
dc.date.issued 1970
dc.identifier.citation O'Neill, Malcolm Ross, 1940-. "Polarized electrons from penning ionization in a flowing helium afterglow." (1970) Master’s Thesis, Rice University. https://hdl.handle.net/1911/89132.
dc.identifier.urihttps://hdl.handle.net/1911/89132
dc.description.abstract An experimental apparatus is described which provides a spatial decay of the excited species from a helium discharge. This "flowing afterglow" has been constructed and the helium metastable atoms He(23S1) are seen to decay over a distance of approximately 30 cm at a helium flow, rate which produces a pressure of 0.1 Torr in the afterglow. The He(23S1) atoms can be polarized using a high intensity helium lamp which produces circularly polarized light. The light propagates in the direction of a weak magnetic field which produces Zeeman splitting of the energy states of the metastable atom. Polarizations of the metastables reach 60 percent. The thesis describes the production of polarized electrons from Penning reactions between polarized metastables (mj = +1) and impurities (mj = 0), A detectable electron polarization will lend credence to the Wigner spin rule and make possible a study of the spin dependence of Penning ionization reactions. Extraction of electrons from the afterglow and analysis by the techniques of high energy Mott scattering are also described. No electron polarization measurements have yet been made due to difficulties in extracting and collimating the electron beam.
dc.format.extent 172 pp
dc.language.iso eng
dc.title Polarized electrons from penning ionization in a flowing helium afterglow
dc.identifier.digital RICE0169
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Physics
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Masters
thesis.degree.name Master of Arts
dc.format.digitalOrigin reformatted digital
dc.identifier.callno Thesis Phys. 1970 O'Neill


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