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arXiv · 1205.4974

Observation of blue-shifted ultralong-range Cs$_{2}$ Rydberg molecules

J. Tallant·S. T. Rittenhouse·D. Booth·H. R. Sadeghpour·J. P. Shaffer
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Abstract

We observe ultralong-range blue-shifted Cs$_{2}$ molecular states near $ns_{1/2}$ Rydberg states in an optical dipole trap, where $31\leq n\leq34$. The accidental near degeneracy of $(n-4)l$ and $ns$ Rydberg states for $l>2$ in Cs, due to the small fractional $ns$ quantum defect, leads to non-adiabatic coupling among these states, producing potential wells above the $ns$ thresholds. Two important consequences of admixing high angular momentum states with $ns$ states are the formation of large permanent dipole moments, $\sim 15-100\,$Debye, and accessibility of these states via two-photon association. The observed states are in excellent agreement with theory. Both projections of the total angular momentum on the internuclear axis are visible in the experiment.

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J. Tallant, S. T. Rittenhouse, D. Booth, H. R. Sadeghpour, J. P. Shaffer. 2012-05-22. Observation of blue-shifted ultralong-range Cs$_{2}$ Rydberg molecules. https://doi.org/10.1103/physrevlett.109.173202

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