功能化芳烃的光循环和激光冷却途径
Pathway Towards Optical Cycling and Laser Cooling of Functionalized Arenes
摘要：
快速和重复的光子循环使得能够使用各种原子和简单分子进行精确计量和量子信息系统的开发。将光学循环扩展到结构复杂的分子将在这些领域以及超冷化学中提供新的能力。然而，分子复杂性的增加使得实现闭合光学跃迁更加困难。在已经建立的双原子、线性三原子和对称顶部分子的强光学循环的基础上，最近的理论和实验工作表明，循环将可扩展到含苯酚的分子以及其他不对称物质。这些系统的范例是使用键合到分子配体的光循环中心。理论表明，循环可以扩展到更大的配体，如萘，芘和晕苯。在这里，我们研究了分子CaO-2-naphthyl，SrO-2-naphthyl和CaO-1-naphthyl的光激发和振动分支，发现只有微弱的衰减到激发振动态，表明一个有前途的路径，以充分的量子控制和激光冷却的大芳烃分子。
英文摘要：
Rapid and repeated photon cycling has enabled precision metrology and the development of quantum information systems using a variety of atoms and simple molecules. Extending optical cycling to structurally complex molecules would provide new capabilities in these areas, as well as in ultracold chemistry. Increased molecular complexity, however, makes realizing closed optical transitions more difficult. Building on the already established strong optical cycling of diatomic, linear triatomic, and symmetric top molecules, recent theoretical and experimental work has indicated that cycling will be extendable to phenol containing molecules, as well as other asymmetric species. The paradigm for these systems is the use of an optical cycling center bonded to a molecular ligand. Theory has suggested that cycling may be extended to even larger ligands, like naphthalene, pyrene and coronene. Here, we study the optical excitation and vibrational branching of the molecules CaO-2-naphthyl, SrO-2-naphthyl and CaO-1-naphthyl and find only weak decay to excited vibrational states, indicating a promising path to full quantum control and laser cooling of large arene-based molecules.
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