Spectroscopy of alkali alkaline-earth molecules for applications in ultracold ensembles of paramagnetic molecules

超冷分子是目前计量学研究、基本物理常数随时间变化的基本问题、超冷化学和量子气体或量子信息等领域的研究热点。这一活动应用了具有抗磁性基态的双原子碱分子和碱土分子。最近，很少有地方进行向Rbsr、LiYb和RbYb等顺磁物种开放这一领域的实验。这将允许制备未探索的超冷气体系统。但在这类分子(碱原子对和碱土原子对)中，光谱数据严重缺失，因此实验计划主要依赖从头计算，这些计算经常提供良好的指导，但不够精确和定量的预测。根据我们的建议，我们将通过典型的例子系统地研究这类分子的光谱，并推导出分子相互作用势、自旋旋转和超精细相互作用，这些都是评估上述对Rbsr、LiYb和RbYb所做努力所需的。这也将为检验和改进从头计算提供参考。由于我们在双原子碱和碱土分子方面的工作非常成功，我们在实验装置和预期的密集光谱的理论评估中做好了充分的准备。

Ultracold molecules are in the focus of present research in the field of metrological research, fundamental questions on time dependence of fundamental physical constants, ultracold chemistry and quantum gases or quantum information. This activity applies the diatomic alkali and alkaline earth molecules with their diamagnetic ground states. Recently, at few places experiments are undertaken to open this field to paramagnetic species like RbSr, LiYb and RbYb. This would allow the preparation of unexplored systems of ultracold gases. But in this class of molecules (pairs of alkali atoms and alkaline earth atoms) spectroscopic data are greatly missing, thus the planning of experiments relies mainly on ab initio calculations, which regularly deliver good guidance, but not sufficiently precise and quantitative predictions. With our proposal we will systematically study the spectroscopy of this class of molecules by representative examples and derive molecular interaction potentials, spin-rotation and hyperfine interactions, needed for the evaluation of the above mentioned efforts on RbSr, LiYb and RbYb. This will also provide references for checking and improving ab initio calculations. Because of our very successful work on diatomic alkali and alkaline earth molecules we are well prepared in the experimental setup and for the theoretical evaluation of expected dense spectra.