Dresden 2011 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 18: Experimental Techniques and Various Topics
MO 18.5: Vortrag
Mittwoch, 16. März 2011, 17:30–17:45, MER 02
Precision Spectroscopy of the 207Pb19F molecule: Implications for measurement of P-odd and T-odd effects — •J.-U. Grabow1, L. D. Alphei1, R. J Mawhorter2, B. Murphy2, A. Baum2, T. J. Sears3, T. Zh. Yang4, P. M. Rupasinghe4, C. P. McRaven4, and N. E. Shafer-Ray4 — 1Gottfried-Wilhelm-Leibniz-Universität, Hannover, Germany — 2Pomona College, Claremont CA, USA — 3Brookhaven National Laboratory, Upton NY, USA — 4University of Oklahoma, Norman OK, USA
Heavy paramagnetic diatomic molecules enhance interactions that exhibit violation of discrete symmetries. Its extent may help to differentiate between the Standard Model and alternate theories of matter. One reason for enhancing the effect of discrete symmetry violation is that such molecules have closely spaced levels of opposite parity, allowing states of mixed parity to be accessible at laboratory-strength electromagnetic fields. In addition, nuclear interactions grow in strength with mass, enhancing both nuclear effects that are odd upon the inversion of spatial symmetry (P-odd) and/or reversal of time (T-odd). Finally, the electronic orbit of an unpaired electron is highly relativistic providing a linear sensitivity to an e-EDM, despite the fact that (classically) the average electric field must be zero.
The complex hyperfine structure of the 207Pb19F isotopologue allows for nearly-degenerate states of opposite parity. We present the hyperfine split spin-rotational spectrum of the ground state obtained using the COBRA Fourier transform microwave (FT-MW) spectrometer at the Gottfried-Wilhelm Leibniz-Universität Hannover.