All-optical preparation of molecular ions in the rovibrational ground state
All-optical preparation of molecular ions in the rovibrational ground state
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DOI：
10.1038/nphys1605
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发表时间：
2010-04
期刊：
影响因子：
19.6
通讯作者：
T. Schneider;B. Roth;H. Duncker;I. Ernsting;S. Schiller
中科院分区：
文献类型：
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作者：
T. Schneider;B. Roth;H. Duncker;I. Ernsting;S. Schiller
在冷量子物质领域，中性和带电气相分子的运动自由度的控制已经实现了广泛的物种，。然而，内部自由度的冷却仍然具有挑战性。最近，转移到内部基态的复杂的光学技术已被证明为中性碱金属二聚体在单量子态从超冷原子，。在这里，我们展示了冷却的旋转自由度的异质双原子分子的内部状态的热分布，使用一个简单的，强大的和一般的光泵浦方案与两个低功率连续波激光器。以被囚禁和冷却的氘化氢（HD+）分子离子为模型系统，我们获得了78%（4）的振转基态布居。旋转、振动和折射冷的分子离子系综适用于许多应用，例如产生长寿命的相干态或基本常数的频率计量。
In the field of cold quantum matter, control of the motional degrees of freedom of both neutral and charged gas-phase molecules has been achieved for a wide range of species,,,,,,,,,,. However, cooling of the internal degrees of freedom remains challenging. Recently, transfer to the internal ground state by sophisticated optical techniques has been demonstrated for neutral alkali dimers created in single quantum states from ultracold atoms,,,. Here we demonstrate cooling of the rotational degree of freedom of heteronuclear diatomic molecules with a thermal distribution of internal states, using a simple, robust and general optical-pumping scheme with two low-power continuous-wave lasers. With trapped and translationally cooled hydrogen deuteride (HD+) molecular ions as a model system, we achieve 78(4)% rovibrational ground-state population. The rotationally, vibrationally and translationally cold molecular ion ensemble is suitable for a number of applications, such as generation of long-lived coherences or frequency metrology of fundamental constants,.