Experimental Investigation of the 6s 2 1 S 0 ! 5d6s 3 D 1;2 Forbidden Transitions in Atomic Ytterbium Lbnl Preprint Number 42454

We have observed the Stark-induced 6s 1S0 ! 5d6s 3D1 transition in Yb and measured properties relevant to the study of atomic parity nonconservation in this transition. An atomic beam of Yb is excited by 408 nm light in the presence of an external DC electric eld, resulting in cascade uorescence at 556 nm as the excitation decays through the 6s6p 3P1 state. The density of the atomic beam and the uorescence detection e ciency are calibrated by directly exciting the 6s6p 3P1 state with 556 nm light. Using an estimate of the 3D1 3P1 branching fraction, we obtain a measurement of the vector transition polarizability, j j = 2:18(33) 10 8 ea0=(V=cm): In addition, we have observed the 6s 1S0 ! 5d6s 3D2 transition at 404 nm. The electric quadrupole transition amplitude and tensor transition polarizability have been measured. We have also measured the DC Stark shifts, hyper ne structure, and isotope shifts for both transitions.