We present an experimental study of the high-energy excitation spectra of unitary Fermi gases. Using focused beam Bragg spectroscopy, we locally probe atoms in the central region of a harmonically trapped cloud where the density is nearly uniform, enabling measurements of the dynamic structure factor for a range of temperatures both below and above the superfluid transition. Applying sum rules to the measured Bragg spectra, we resolve the characteristic behavior of the universal contact parameter,

, across the superfluid transition. We also employ a recent theoretical result for the kinetic (second-moment) sum rule to obtain the internal energy of gases at unitarity.

我们目前对单一费米气体的高能激发光谱进行实验研究。使用聚焦束布拉格光谱法，我们在密度几乎均匀的谐波捕获云的中心区域中局部探测原子，从而能够测量超流体转变以上和以下温度范围内的动态结构因子。将求和规则应用于测得的布拉格光谱，我们可以解决通用接触参数的特征行为，

，跨越超流体过渡。我们还对动力学（第二矩）求和规则采用了最新的理论结果，从而获得了气体在单一性下的内部能量。