Abstract
Experimental techniques to manipulate cold molecules have seen great development in recent years. The precision measurements of cold molecules are expected to give insights into fundamental physics. Here we use a rovibrationally pure sample of ultracold KRb molecules to improve the measurement on the stability of electron-to-proton mass ratio left( {mu = frac{{m_{mathrm{e}}}}{{M_{mathrm{p}}}}} right). The measurement is based upon a large sensitivity coefficient of the molecular spectroscopy, which utilizes a transition between a nearly degenerate pair of vibrational levels each associated with a different electronic potential. Observed limit on temporal variation of μ is frac{1}{mu }frac{{dmu }}{{dt}} = (0.30 pm 1.0) times 10^{ - 14} , {mathrm{year}}^{ - 1}, which is better by a factor of five compared with the most stringent laboratory molecular limits to date. Further improvements should be straightforward, because our measurement was only limited by statistical errors.
Highlights
Experimental techniques to manipulate cold molecules have seen great development in recent years
The measurement is based upon a large sensitivity coefficient of the molecular spectroscopy, which utilizes a transition between a nearly degenerate pair of vibrational levels each associated with a different electronic potential
We have derived a molecular limit on the temporal variation of μ by observing the microwave transition of photoassociated KRb molecules
Summary
Experimental techniques to manipulate cold molecules have seen great development in recent years. The precision measurements of cold molecules are expected to give insights into fundamental physics. . The measurement is based upon a large sensitivity coefficient of the molecular spectroscopy, which utilizes a transition between a nearly degenerate pair of vibrational levels each associated with a different electronic potential. Further improvements should be straightforward, because our measurement was only limited by statistical errors. 1234567890():,; Cold molecules are becoming a popular tool for precision measurements. Cold molecules have a number of advantages for increasing the precision, like longer interaction time, smaller motional decoherence, and it is easier to make use of its rich internal degrees of freedom[4]. In the case of EDM experiments, molecules (and molecular ions) were placed in Ω doublet levels, where large internal electric field and systematic error rejection are available[5]
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