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光缔合制备超冷铯分子的温度测量
The temp erature measurement for the ultracold Cs2 molecules formed by photoasso ciation
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摘要: 利用光缔合超冷Cs原子形成超冷Cs2分子，采用多光子电离方法对超冷Cs2分子进行探测，对分子扩散过程中分子密度随时间的演化进行测量，获得了超冷Cs2分子的弛豫曲线。基于一个简单的模型即原子、分子样品的初始分布是位置和速度的高斯函数，通过理论模拟获得了超冷原子、分子样品的温度，测得的原子温度与释放-再俘获方法获得的结果相符合，这种方法避免了通过探测微弱分子荧光来获得分子温度的弊端，可广泛应用于超冷原子、分子样品的温度测量。Abstract: Ultracold Cs2 molecules have been formed by photoassociation. Using the multiphoton ionization technique, we measure the time-evolution of expanding process in ultracold Cs2 molecule system and obtain the decay curve of pho-toionization signals. Based on a simple case, where the initial distribution of atomic or molecular sample is a Gaussian function of position and of velocity, we get the sample’s temperature by theoretical simulation. The result shows a reasonable agreement with the result of release-recapture method in cold atom sample. This method avoids the disad-vantage of detecting the weakly fluorescence and can be widely used for measuring the temperature in cold atom or cold molecule system.
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