Ultra-long-range Rydberg molecules in a divalent atomic system

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We report the creation of ultra-long-range Sr2 molecules comprising one ground-state 5s2 1S0 atom and one atom in a 5sns 3S1 Rydberg state for n ranging from 29 to 36. Molecules are created in a trapped ultracold atomic gas using two-photon excitation near resonant with the 5s5p 3P1 intermediate state, and their formation is detected through ground-state atom loss from the trap. The observed molecular binding energies are reproduced with the aid of first-order perturbation theory that utilizes a Fermi pseudopotential with effective s-wave and p-wave scattering lengths to describe the interaction between an excited Rydberg electron and a ground-state Sr atom.

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DeSalvo, B.J., Aman, J.A., Dunning, F.B., et al.. "Ultra-long-range Rydberg molecules in a divalent atomic system." Physical Review A, 92, no. 3 (2015) American Physical Society: 031403(R). http://dx.doi.org/10.1103/PhysRevA.92.031403.

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