Physics
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mss..confera07m&link_type=abstract
"International Symposium On Molecular Spectroscopy, 66th Meeting, Held 20-24 June, 2011 at Ohio State University. http://molspec
Physics
Mini-Symposium: Fundamental Physics
Scientific paper
A molecule in a state of total angular momentum F has a familiar 2F+1 degeneracy. In the presence of a pure magnetic field, this 2F+1 degeneracy is completely lifted with each magnetic sub-level M_F acquiring its own energy. In the presence of an electric field, quantum states with non-zero magnetic quantum numbers |M_F| remain doubly degenerate. This fact is well established by Stark spectroscopy and is a consequence of time-reversal symmetry. In 1950, Purcell and Ramsey pointed out that time-reversal symmetry could be broken by the existence of an electric dipole moment of the electron. Over the last 60 years, the interest in such a symmetry breaking dipole moment has increased, in part because it may explain the matter-antimatter asymmetry of the Universe, and in part because it could help to differentiate between competing fundamental models of Physics. If large enough, such a dipole moment could lead to an observable lifting of the degeneracy between +M_F and -M_F states of a molecule in a pure electric field. We report on progress toward searching for an electric dipole moment by an optical quantum beat experiment utilizing the X_1 ^2Π1/2 state of PbF molecule.
Moore-Furneaux John
Shafer-Ray N. E.
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