Preparation of a pure molecular quantum gas
Preparation of a pure molecular quantum gas
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DOI：
10.1126/science.1088876
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发表时间：
2003-09-12
期刊：
影响因子：
56.9
通讯作者：
Grimm, R
中科院分区：
文献类型：
--
作者：
Herbig, J;Kraemer, T;Grimm, R
一种超冷分子量子气体是通过对铯原子的玻色-爱因斯坦凝聚体施加穿过费什巴赫共振的磁场扫描而产生的。将分子与原子分离的能力使纯分子样品可以直接成像。磁悬浮能够在扩展的时间尺度上研究系综的动力学。我们测量了3000个分子样本在几纳开尔文范围内的超低膨胀能。我们的观察结果与宏观分子物质波的存在是一致的。
An ultracold molecular quantum gas is created by application of a magnetic field sweep across a Feshbach resonance to a Bose-Einstein condensate of cesium atoms. The ability to separate the molecules from the atoms permits direct imaging of the pure molecular sample. Magnetic levitation enables study of the dynamics of the ensemble on extended time scales. We measured ultralow expansion energies in the range of a few nanokelvin for a sample of 3000 molecules. Our observations are consistent with the presence of a macroscopic molecular matter wave.