Light-induced frequency shifts for the lowest vibrational levels of ultracold Cs₂ in the molecular pure long-range 0_{\mathrm{g}}^{-} state

Abstract

The light-induced frequency shift (LIFS) of ultracold molecular ro-vibrational levels originates from the strong coupling of the atomic-scattering state and the bound-molecular state. In this paper, we present our experimental determination of the LIFSs of the lowest vibrational levels (ν= 0, 1) in the purely long-range 0_{\mathrm{g}}^{-} state of ultracold cesium molecules. A high-resolution double photoassociation spectroscopy is developed, which serves as frequency ruler to measure the frequency shifts of the lowest molecular levels for Cs₂. The experimental results are qualitatively consistent with the theoretical expectations.

Keywords

light-induced frequency shift / ultracold molecule / double photoassociation spectroscopy / long-range state

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