Studies of U6+ with the RESIS method: difficulties and future directions
| dc.contributor.author | Smith, Christopher Scott, author | |
| dc.contributor.author | Lundeen, Stephen R., advisor | |
| dc.contributor.author | Bartels, Randy A., committee member | |
| dc.contributor.author | Roberts, Jacob L., committee member | |
| dc.contributor.author | Wu, Mingzhong, committee member | |
| dc.date.accessioned | 2015-08-28T14:35:03Z | |
| dc.date.available | 2015-08-28T14:35:03Z | |
| dc.date.issued | 2015 | |
| dc.description.abstract | This dissertation analyzes the details of previous resonant excitation Stark ionization spectroscopy (RESIS) measurements carried out on U5+ Rydberg states, aiming to determine properties of the ground state of U6+. These measurements were unsuccessful for apparently two reasons, a large background, and unexpectedly small signal sizes. It has been concluded that the background is a result of a prodigious amount of metastable states within the initial U6+ ion beam. Detailed simulations of the metastable population within the beamline showed the metastable hypothesis is plausible. Some reduction of the background within the RESIS technique was achieved with a redesign of the detection region in the apparatus. Detailed simulations of the RESIS signal size showed that the experimental resolved signals of the U5+ Rydberg states were no more than 1/4 the size expected from just ground state signal ions. A satisfactory explanation was proposed that metastable Rydberg ions bound to the lowest metastable level (J = 1) are forbidden to autoionize and can contribute to the measured signal. These metastable states compose 75% of the measured signal, diluting the ground state signal and preventing identification of the resolved signals. A possible future approach to the U5+ Rydberg state experiment is proposed that probes the Rydberg electron energies with a 1.5 μm laser, and looks like it could successfully measure the properties of the U6+ ion. | |
| dc.format.medium | born digital | |
| dc.format.medium | doctoral dissertations | |
| dc.identifier | Smith_colostate_0053A_13046.pdf | |
| dc.identifier.uri | http://hdl.handle.net/10217/167083 | |
| dc.language | English | |
| dc.language.iso | eng | |
| dc.publisher | Colorado State University. Libraries | |
| dc.relation.ispartof | 2000-2019 | |
| dc.rights | Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. | |
| dc.subject | spectroscopy | |
| dc.subject | uranium | |
| dc.subject | thorium | |
| dc.subject | RESIS | |
| dc.title | Studies of U6+ with the RESIS method: difficulties and future directions | |
| dc.type | Text | |
| dcterms.rights.dpla | This Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). | |
| thesis.degree.discipline | Physics | |
| thesis.degree.grantor | Colorado State University | |
| thesis.degree.level | Doctoral | |
| thesis.degree.name | Doctor of Philosophy (Ph.D.) |
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