We report the high-resolution photoassociation (PA) spectroscopy of a ${}^{87}\mathrm{Rb}$ Bose-Einstein condensate (BEC) to excited molecular states near the dissociation limit of $5P_{1/2}+5S_{1/2}$ by optical Bragg scattering. Since the detection of optical Bragg scattering in the BEC has a high signal-noise ratio, we obtain the high-resolution PA spectrum of excited molecular states in the range of $\pm 1$ GHz near the dissociation limit of $5P_{1/2}+5S_{1/2}$. We compare the results with the conventional method of trap loss and show that the results agree with each other very well. Many interesting phenomena of excited molecular states are observed, such as light-induced frequency shift and anomalous strong bound molecular lines at the atomic transition from $|F=1\rangle$ to $|F^{\prime }=2\rangle$. The observed excited molecular states in the range of $\pm 1$ GHz near the dissociation limit of $5P_{1/2}+5S_{1/2}$ should help to further improve long-range bound-state models near the dissociation limit.

中文翻译：

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Bose-Einstein凝聚体中的光学布拉格散射通过5P1 / 2 + 5S1 / 2阈值附近的弱结合Rb287分子的光缔合光谱

我们报告了高分辨率的光缔合（PA）光谱 ${}^{87}b$ 玻色-爱因斯坦凝聚物（BEC）激发到接近解离极限的分子态 $5P_{\mathrm{1个}/2}+5{\mathrm{小号}}_{\mathrm{1个}/2}$通过光学布拉格散射。由于BEC中光学布拉格散射的检测具有很高的信噪比，因此我们获得了在以下范围内的激发分子态的高分辨率PA光谱：$\pm \mathrm{1个}$ 接近解离极限的GHz $5P_{\mathrm{1个}/2}+5{\mathrm{小号}}_{\mathrm{1个}/2}$。我们将结果与陷阱损失的常规方法进行了比较，结果表明结果非常吻合。观察到许多有趣的激发分子态现象，例如光诱导的频移和从原子跃迁到原子跃迁的异常强束缚分子线。$|F=\mathrm{1个}〉$ 至 $|F^{\prime }=2〉$。观察到的激发分子态在$\pm \mathrm{1个}$ 接近解离极限的GHz $5P_{\mathrm{1个}/2}+5{\mathrm{小号}}_{\mathrm{1个}/2}$ 应该有助于进一步改善离解极限附近的远程束缚态模型。