Precise study of asymptotic physics with subradiant ultracold molecules
Precise study of asymptotic physics with subradiant ultracold molecules
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DOI：
10.1038/nphys3182
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发表时间：
2014-07
期刊：
影响因子：
19.6
通讯作者：
B. Mcguyer;M. McDonald;G. Iwata;M. Tarallo;W. Skomorowski;W. Skomorowski;R. Moszynski;T. Zelevinsky
中科院分区：
文献类型：
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作者：
B. Mcguyer;M. McDonald;G. Iwata;M. Tarallo;W. Skomorowski;W. Skomorowski;R. Moszynski;T. Zelevinsky
弱键合分子具有没有原子类似物的物理性质，即使键长接近解离。例如，同质双原子分子的内部对称性导致两体超辐射和亚辐射激发态的形成。尽管超辐射已在各种系统中得到证实，但亚辐射由于与环境的固有弱相互作用而更加难以捉摸。在这里，我们通过精确的光学光谱学与最长的分子-光相干相互作用时间，迄今为止，具有超过1013的内在品质因子的深亚辐射分子态的特性。我们发现，两个竞争的影响限制了亚辐射分子的寿命，具有不同的渐近行为。第一种是通过弱磁偶极和电四极相互作用的辐射衰变。我们证明了它的速率随着键长的平方增加，证实了量子力学的预测。第二种是通过弱陀螺预解离的非辐射衰变，其速率与振动模式间距成比例，并且对短程物理敏感。这项工作的桥梁之间的差距差距原子和分子计量学的基础上晶格时钟技术，提高我们的理解长程原子间的相互作用。
Weakly bound molecules have physical properties without atomic analogues, even as the bond length approaches dissociation. For instance, the internal symmetries of homonuclear diatomic molecules result in the formation of two-body superradiant and subradiant excited states. Whereas superradiance,,has been demonstrated in a variety of systems, subradiance,,is more elusive owing to the inherently weak interaction with the environment. Here we characterize the properties of deeply subradiant molecular states with intrinsic quality factors exceeding 1013via precise optical spectroscopy with the longest molecule–light coherent interaction times to date. We find that two competing effects limit the lifetimes of the subradiant molecules, with different asymptotic behaviours. The first is radiative decay via weak magnetic-dipole and electric-quadrupole interactions. We prove that its rate increases quadratically with the bond length, confirming quantum mechanical predictions. The second is non-radiative decay through weak gyroscopic predissociation, with a rate proportional to the vibrational mode spacing and sensitive to short-range physics. This work bridges the gap between atomic and molecular metrology based on lattice-clock techniques, enhancing our understanding of long-range interatomic interactions.