论文标题
NACS Feshbach分子的高相空间密度气体
A High Phase-Space Density Gas of NaCs Feshbach Molecules
论文作者
论文摘要
我们报告了NACS骨体Feshbach分子的超速气体的产生。这些分子是通过在864.12（5）G中使用Feshbach共振的Na和Cs重叠的气体相关的。我们使用结合状态光谱和耦合 - 通道计算来表征Feshbach的共振。通过改变初始原子混合物的温度和原子数，我们证明了NACS气体在分子数和温度范围内的NACS气体的关联，对于我们最冷的系统，达到70 nk，相位空间密度接近0.1。这是在其绝对基态以强偶极NACS分子的变性气体产生的重要垫脚石。
We report on the creation of ultracold gases of bosonic Feshbach molecules of NaCs. The molecules are associated from overlapping gases of Na and Cs using a Feshbach resonance at 864.12(5) G. We characterize the Feshbach resonance using bound state spectroscopy, in conjunction with a coupled-channel calculation. By varying the temperature and atom numbers of the initial atomic mixtures, we demonstrate the association of NaCs gases over a wide dynamic range of molecule numbers and temperatures, reaching 70 nK for our coldest systems and a phase-space density near 0.1. This is an important stepping-stone for the creation of degenerate gases of strongly dipolar NaCs molecules in their absolute ground state.
