Studies of U6+ with the RESIS Method : difficulties and future directions
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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 ...