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Chinese Physics Letters

Measurement of Ionization Threshold of Ultracold Cesium Rydberg Atoms in Static Electric Field

冯志刚, 张临杰, Jianming Zhao, 李昌勇, 李安玲, 贾锁堂

Published Jan 1, 2008• 0 citations
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Abstract

我们调查极端冷铯 Rydberg 原子的地电离系列在电场。不同电场的电离阀值被测量，相对没有地的电离阀值的电离阀值的移动精确地被描述由(6.06 +/- 0.14 ) F-1/2，它在对为地电离的古典僵绳点模型的好同意。我们作为 19674.89 +/- 获得铯(6P (3/2 )) 的没有地的电离阀值 2.99 厘米(由恰当的试验性的数据的 -1) 。

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物理学前沿：英文版•Jan 1, 2014•0 citations
我们调查极端冷铯 Rydberg 原子的地电离系列在电场。不同电场的电离阀值被测量，相对没有地的电离阀值的电离阀值的移动精确地被描述由(6.06 +/- 0.14 ) F-1/2，它在对为地电离的古典僵绳点模型的好同意。我们作为 19674.89 +/- 获得铯(6P (3/2 )) 的没有地的电离阀值 2.99 厘米(由恰当的试验性的数据的 -1) 。
We investigate the field ionization spectra of ultracold cesium Rydberg atoms in dc electric field. The ionization thresholds of different electric fields are measured and shift of the ionization threshold relative to field-free ionization threshold is accurately described by (6.06 ± 0.14) F 1/2 , which is in good agreement with the classical saddle-point model for field ionization. We obtain the field-free ionization threshold of cesium (6P 3/2 ) as 19674.89 ± 2.99 cm −1 by fitting experimental data.
Ultracold cesium n S ( n =60–70) Rydberg atoms are prepared using the two-photon scheme in a magneto-optical trap (MOT). The number of resonant Rydberg atoms is measured by the pulsed field ionization technique, and the dependences of the Rydberg signal on excitation duration and external DC electric field are investigated. The excitation dynamics and blockade effects due to long-range interactions are obtained. The effect of external electric field on Rydberg excitation is also investigated, and the experimental result shows an enhanced blockade with a weak external electric field.
State-mixing effect of ultracold nS cesium Rydberg atoms in an external electric field is investigated in a magneto-optical trap. Populated high-l Rydberg atoms due to the state-mixing through avoided crossings are measured with a state-selective field ionization technique. The measured transfer rates of high-l states increase with the electric field and get to the maximum at the field of about 3.0 V/cm for 49S1/2 Rydberg state, and show decrease behavior when the electric field increases further. The decrease behavior of the transfer rate is explained with the slower m-mixing effect caused by decreasing dipole–dipole interactions between high-l Rydberg atoms. During the m-mixing process the ultracold plasma is formed by the Penning ionization.
在 ultracold Rydberg 气体的学习的最近的开发要求试验性的精深，高原子、光的密度必须与外部领域和敏感 Rydberg 原子察觉的优秀控制在被相结合的先进水平。我们描述过去常生产并且学习从稠密的 ultracold 激动的交往 Rydberg 原子的一个定制的试验性的系统原子气体。实验用高流动寒冷原子来源和三根横梁为快责任周期被优化了光偶极子陷井。后者启用在几个数量级上原子密度和温度调节，一路上到 Bose 爱因斯坦冷凝作用转变。包围原子的电极结构允许对电场和 Rydberg 原子的单个粒子的敏感领域电离察觉的精确控制。我们考察在不同许多身体系统上加亮强壮的 Rydberg-Rydberg 相互作用的影响的二个实验。首先， Rydberg 封锁效果习惯于预先组织在它进 ultracold 血浆的自发的进化以前的原子气体。第二，称为黑暗状态的电磁声子的光子和原子的混合状态被学习。由看 Rydberg 激动的原子的统计分发，我们揭示在黑暗状态的电磁声子之间的关联。这些实验将最终在强烈交往的政体提供许多身体现象的更深的理解，包括在在量水平的原子和灯之间的强烈联合的血浆和接口的学习。