Hannover 2013 – scientific programme
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MO: Fachverband Molekülphysik
MO 19: Poster 2: Biomolecules, Cold Molecules, Experimental Techniques, Various Topics
MO 19.30: Poster
Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof
High Resolution Rotational Spectroscopy of Zeeman and Hyperfine Effects in PbF and YbF — •Richard Mawhorter1, Alex Baum1, Zachary Glassman1, Benjamin Girodias1, Trevor Sears2, Neil Shafer-Ray3, Lukas Alphei4, and Jens-Uwe Grabow4 — 1Pomona College, Claremont, CA — 2Brookhaven National Laboratory, Upton, NY — 3University of Oklahoma, Norman, OK — 4PCI, Leibniz Universität, Hannover
Motivated by the ongoing search for the CP-violating electron electric dipole moment (e-EDM), rotational spectra of the radicals 207Pb19F and 208Pb19F were measured using a supersonic jet Fourier transform microwave spectrometer. Zeeman splitting was examined for 19 J = 1/2 and J = 3/2 transitions in magnetic fields up to 4 Gauss. Transitions were observed with 0.5 kHz accuracy and 6 kHz pair resolution over a range of 2 - 26.5 GHz. The observation of these field dependent spectra allowed for the determination of the two body fixed g-factors, G⊥ and G∥. We will compare our results with recent theoretical values. Experiments on 174YbF determine the current eEDM upper limit. Although YbF is more sensitive to magnetic fields than PbF, measuring the nuclear quadrupole hyperfine structure of 173YbF can help characterize the critical electric field at the heavy atom nucleus. We will report on 14 GHz transitions for 3 of the less abundant even isotopologues of YbF as well as for the 207PbF analogue 171YbF, important steps towards observing 173YbF. TS acknowledges support from DOE DE-AC02-98CH10886, NS from NSF-0855431, and JUG and LA from DFG and Land Niedersachsen.