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Observation of Feshbach resonances in an ultracold gas of ${}^{52}$Cr

J. Werner·A. Griesmaier·S. Hensler·J. Stuhler·T. Pfau·A. Simoni·E. Tiesinga
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Abstract

We have observed Feshbach resonances in elastic collisions between ultracold ${}^{52}$Cr atoms. This is the first observation of collisional Feshbach resonances in an atomic species with more than one valence electron. The zero nuclear spin of ${}^{52}$Cr and thus the absence of a Fermi-contact interaction leads to regularly-spaced resonance sequences. By comparing resonance positions with multi-channel scattering calculations we determine the s-wave scattering length of the lowest $^{2S+1}Σ_{g}^{+}$ potentials to be $\unit[112(14)]{a_0}$, $\unit[58(6)]{a_0}$ and $-\unit[7(20)]{a_0}$ for S=6, 4, and 2, respectively, where $a_{0}=\unit[0.0529]{nm}$.

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J. Werner, A. Griesmaier, S. Hensler, J. Stuhler, T. Pfau, A. Simoni, E. Tiesinga. 2004-12-03. Observation of Feshbach resonances in an ultracold gas of ${}^{52}$Cr. https://doi.org/10.1103/physrevlett.94.183201

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