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arXiv:2306.00981 [physics.atom-ph]AbstractReferencesReviewsResources

Precise Determination of Blackbody Radiation Shifts in a Strontium Molecular Lattice Clock

B. Iritani, E. Tiberi, W. Skomorowski, R. Moszynski, M. Borkowski, T. Zelevinsky

Published 2023-06-01Version 1

Molecular lattice clocks enable the search for new physics, such as fifth forces or temporal variations of fundamental constants, in a manner complementary to atomic clocks. Blackbody radiation (BBR) is a major contributor to the systematic error budget of conventional atomic clocks and is notoriously difficult to characterize and control. Here, we combine infrared Stark-shift spectroscopy in a molecular lattice clock and modern quantum chemistry methods to characterize the polarizabilities of the Sr$_2$ molecule from dc to infrared. Using this description, we determine the static and dynamic blackbody radiation shifts for all possible vibrational clock transitions to the $10^{-16}$ level. This constitutes an important step towards mHz-level molecular spectroscopy in Sr$_2$, and provides a framework for evaluating BBR shifts in other homonuclear molecules.

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