Long-range potentials and $(n-1)d+ns$ molecular resonances in an ultracold rydberg gas

Details Long-range potentials and $(n-1)d+ns$ molecular resonances in an ultracold rydberg gas Long-range potentials and $(n-1)d+ns$ molecular resonances in an ultracold rydberg gas

2008-01-15

arxiv.org/abs/0801.2386v1

Physics

Atomic Physics

11 pages, 7 figures

Scientific paper

10.1103/PhysRevA.78.052709

We have calculated long-range molecular potentials of the $0_g^{+}$, $0_u^{-}$ and $1_u$ symmetries between highly-excited rubidium atoms. Strong $np+np$ potentials characterized by these symmetries are important in describing interaction-induced phenomena in the excitation spectra of high $np$ Rydberg states. Long-range molecular resonances are such phenomena and they were first reported in S.M. Farooqi {\it et al.}, Phys. Rev. Lett. {\bf 91} 183002. One class of these resonances occurs at energies corresponding to excited atom pairs $(n-1)d+ns$. Such resonances are attributed to $\ell$-mixing due to Rydberg-Rydberg interactions so that otherwise forbidden molecular transitions become allowed. We calculate molecular potentials in Hund's case (c), use them to find the resonance lineshape and compare to experimental results.

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