Measurement of the electron electric dipole moment using YbF molecules
J. J. Hudson, B. E. Sauer, M. R. Tarbutt, E. A. Hinds
Abstract
The most sensitive measurements of the electron electric dipole moment de have previously been made using heavy atoms. Heavy polar molecules offer a greater sensitivity to de because the interaction energy to be measured is typically 103 times larger than in a heavy atom. We report the first measurement of this kind, for which we have used the molecule YbF. Together, the large interaction energy and the strong tensor polarizability of the molecule make our experiment essentially free of the systematic errors that currently limit de measurements in atoms. Our first result de = (- 0.2 3.2) x 10-26 e.cm is less sensitive than the best atom measurement, but is limited only by counting statistics and demonstrates the power of the method.
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