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A: Atomphysik
A 10: Atomspektroskopie I
A 10.4: Vortrag
Dienstag, 23. März 2004, 15:15–15:30, HS 133
Measurement of light shift ratios with a single trapped 138Ba ion, and prospects for a parity violation experiment — •Timo Koerber — Institut für Experimentalphysik, Universität Innsbruck
This thesis describes a new scheme for observing RF transitions between spin states in a single, trapped Ba+ ion. We prepare the ion in a selected magnetic sublevel of either the 6S1/2 ground state or the 5D3/2 metastable state. The ion is exposed to an RF field, and a spin-sensitive version of the electron shelving method detects the resulting spin state [1]. This scheme is applied to a precision measurement of light shifts in Ba+: Zeeman energies are altered by a circularly polarized, off-resonant laser, and the resulting resonance shifts are measured simultaneously in both the 6S1/2 and 5D3/2 state. With such a measurement we determine the ratio of P-D to S-P matrix elements with a precision of <0.5%. A similar technique could be employed to measure parity violation with a single ion [2]. The observable in such an measurement is a spin-dependent light shift, induced by a parity-violating E1 transition between the S and D states in Ba+. The experiment and its systematic problems are analyzed in this thesis. We also propose an alternative scheme using odd isotopes and the E2-forbidden F=0↔ F=1 transition, along with an initial investigation of its systematic effects.
[1] T. W. Koerber et. al., PRL 88, 143002 (2003)
[2] N. Fortson, PRL 70, 2383 (1993)