We present perturbations in photoassociation spectra of ultracold caesium. High-precision photoassociation spectra up to 54 cm−1 below the Cs (6S1/2)+Cs(6P1/2) asymptote revealed perturbations related to resonant coupling between electronic states of the same symmetry but belonging to different asymptotes. The perturbations, which are manifested as irregularities in vibrational level spacings, are most pronounced for the 0u+ state, but to some extent present in the 1g and 0g− states, which are also affected by predissociation. We have performed theoretical calculations of perturbations for all three states and found qualitative agreement with the experimental results.We present perturbations in photoassociation spectra of ultracold caesium. High-precision photoassociation spectra up to 54 cm−1 below the Cs (6S1/2)+Cs(6P1/2) asymptote revealed perturbations related to resonant coupling between electronic states of the same symmetry but belonging to different asymptotes. The perturbations, which are manifested as irregularities in vibrational level spacings, are most pronounced for the 0u+ state, but to some extent present in the 1g and 0g− states, which are also affected by predissociation. We have performed theoretical calculations of perturbations for all three states and found qualitative agreement with the experimental results.

Journal of Physics B Atomic Molecular and Optical PhysicsSep 25, 200618 citations

Photoassociation Spectroscopy of Ultracold Atoms and the Study of Physicists' Molecules

K. M. Jones, Eite Tiesinga, Paul D. Lett +1 more

Reviews of Modern PhysicsMay 22, 20063 citations

Effects of perturbations in photoassociation spectra of ultracold Cs

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