ULE cavity applications and other developments at the TRIUMF Francium Beam Trapping Facility
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Date
2018
Authors
DeHart, A. C.
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Abstract
The Francium Group at TRIUMF is preparing to study the parity-violating electric dipole amplitude for the 7s → 8s transition in francium. The parity-violating weak force contributes very small perturbations of electron wave functions which can be explored with spectroscopy for this transition in heavy alkali atoms. This thesis reports on isotope-shift measurements for 7s 1/2 → 8s 1/2 and transitions in isotopes 208−211 Fr and 213 Fr which will help us interpret future atomic parity non-conservation investigations for this element. An ultra low expansion cavity has been implemented in a new laser locking system to support such measurements. With this cavity, we have begun preliminary single-photon Stark-shift investigations of the analogous 5s → 6s transition in 87 Rb. This thesis also reports on other developments at the francium trapping facility such as new transparent indium tin oxide electric field plates for Stark-shift investigations and implementing new OTS dryfilm coatings in our capture cell.
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Keywords
Francium, ULE cavity, TRIUMF, ITO, Isotope-shift, King plot, Parity, Weak force, OTS, Stark