论文标题
基于循环的三级系统，通过RO振动过渡避免了对映体特异性状态转移的热种群影响
Evading thermal population influence in enantiomeric-specific state transfer based on a cyclic three-level system via ro-vibrational transitions
论文作者
论文摘要
理论上已经根据手性分子的三级系统提出了对映体特异性状态转移的光学方法。根据这些理论方法，最近在实验中报道了突破的进步[S. Eibenberger等人，物理。莱特牧师。 118，123002（2017）; C.Pérez等，Angew。化学int。 ed。 56，12512（2017）]用于冷气体性手性分子，但具有低状态特异性的对映体富集。限制因素之一是在实验中选定的三个纯旋转状态中热种群的影响。在这里，我们从理论上提出了一种改进的对映体特异性状态转移的光学方法，以有效地逃避热种群的这种不利影响，通过引入循环三级分子系统的RO振动过渡。然后，在实验的典型温度下，大约仅选择的三级系统中最低的状态被热占用，并且对映体特异性状态传输的光学方法效果很好。与所有三个状态被热占据的纯粹旋转过渡的情况相比，这种修饰将显着增加所获得的特定州特异性对映体富集，而对映体超过约100％。
Optical methods of enantiomeric-specific state transfer had been proposed theoretically based on a cyclic three-level system of chiral molecule. According to these theoretical methods, recently the breakthrough progress has been reported in experiments [S. Eibenberger et al., Phys. Rev. Lett. 118, 123002 (2017); C. Pérez et al., Angew. Chem. Int. Ed. 56, 12512 (2017)] for cold gaseous chiral molecules but with low state-specific enantiomeric enrichment. One of the limiting factors is the influence of the thermal population in the selected three purely rotational states in experiment. Here, we theoretically propose an improved optical method of enantiomeric-specific state transfer to effectively evade such an adverse impact of thermal population by introducing ro-vibrational transitions for the cyclic three-level system of chiral molecules. Then, at the typical temperature in experiments approximately only the lowest state in the chosen three-level system is thermally occupied and the optical method of enantiomeric-specific state transfer works well. Comparing with the case of purely rotational transitions where all the three states are thermally occupied, this modification will remarkably increase the obtained state-specific enantiomeric enrichment with enantiomeric excess approximately 100%.
