与K（$4^2$ S）+Cs（$5^2$ D）渐近线相关的$^{39}$ KCs分子激发电子态的实验和理论研究
Study of excited electronic states of the $^{39}$KCs molecule correlated with the K($4^2$S)+Cs($5^2$D) asymptote: experiment and theory
摘要：
利用偏振标记光谱技术，在$X^1Σ^+$基态的$v=0$能级以上的17500~cm $^{-1}$和18600~cm $^{-1}$激发能区间，对$^{39}$ KCs分子的激发电子态的能级结构进行了详细的分析.我们证明了在18200~cm $^{-1}$以上的自旋-轨道相互作用对所观测到的态是强耦合的，正如在所记录的光谱中的许多微扰所表明的那样。的光谱解释的指导下，精确的电子结构计算KCs，包括势能曲线，过渡电偶极矩，和表示的自旋-轨道相互作用与准绝热有效哈密顿方法。理论和实验之间的协议被发现显着，明确区分现有的理论数据。这项研究证实了偏振标记光谱的准确性，以分析高激发电子分子状态，提出了一个密集的水平结构。
英文摘要：
Using the polarisation labelling spectroscopy, we performed the detailed analysis of the level structure of excited electronic states of the $^{39}$KCs molecule in the excitation energy interval between 17500~cm$^{-1}$ and 18600~cm$^{-1}$ above the $v=0$ level of the $X^1Σ^+$ ground state. We prove that the observed states are strongly coupled by spin-orbit interaction above 18200~cm$^{-1}$, as manifested by numerous perturbations in the recorded spectra. The spectra are interpreted with the guidance of accurate electronic structure calculations on KCs, including potential energy curves, transition electric dipole moments, and representation of the spin-orbit interaction with a quasi-diabatic effective Hamiltonian approach. The agreement between theory and experiment is found remarkable, clearly discriminating among the available theoretical data. This study confirms the accuracy of the polarisation labelling spectroscopy to analyse highly-excited electronic molecular states which present a dense level structure.
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