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plasma Science and Technology 2014年第4期16卷 305-310页

作者：刘金波陆荣华郭丽金玉奇郭敬为 Key Laboratory of Chemical Lasers Dalian Institute of Chemical PhysicsChinese Academy of Sciences Key Laboratory for Quantum Optics and Centre for Cold Atom Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

ultracold plasma provides a possible route to approach the strongly-coupled regime under laboratory conditions. Normally, the lifetime of ultracold plasma is very limited due to plasma heating and expansion mechanisms. We present a new method to generate long lifetime ultracold plasmas consisting mainly of cations and anions. This plasma demonstrates a capability of traversing a DC barrier of up to 5 （or -3） V. The lifetime of this plasma is expected to be more than 250us. Finally, molecular dynamics （MD） simulation is used to explain how anions slow the expansion rate and prolong the lifetime of this plasma.

关键词： ultracold plasma nitric oxide long lifetime

The effect of the direct current electric field on the dynamics of the ultracold plasma

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plasma Science and Technology 2018年第8期20卷 6-10页

作者： Syed ZAHEERUDDIN Yufan LI Dongmei ZHAO Xinwen MA Jie YANG Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 People' s Republic of China University of Chinese Academy of Sciences Beijing 100049 People's Republic of China

We created an ultracold plasma by photoionizing the laser-cooled and trapped rubidium atoms in a magneto-optical trap. In the externally applied direct current（DC） electric field environment,the electrons which escape from the potential well of the ultracold plasma were detected for different numbers of the ions and initial kinetic energies of the electrons. The results are in good agreement with the calculations, based on the Coulomb potential well model, indicating that the external DC field is an effective tool to adjust the depth of potential well of the plasma, and it is possible to create an ultracold plasma in a controlled manner.

关键词： ultracold plasma magneto-optical trap photoionization Coulomb potential well model

Recombination during expansion of ultracold plasma

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Chinese Physics B 2010年第4期19卷 203-207页

作者：赵建明张临杰冯志刚李昌勇贾锁堂 State Key Laboratory of Quantum Optics and Quantum Optics Devices College of Physics and Electronics EngineeringShanxi University

Signals of ultracold plasma are observed by two-photon ionization of laser-cooled caesium atoms in a magnetooptical trap. Recombination of ions and electrons into Rydberg atoms during the expansion of ultracold plasma is investigated by using state-selective field ionization spectroscopy. The dependences of recombination on initial electron temperature （1 70 K） and initial ion density （-10^10 cm-3） are investigated. The measured dependence on initial ion density is N^1.547±0.004 at a delay time of 5μs. The recombination rate rapidly declines as initial electron temperature increases when delay time is increased. The distributions of Rydberg atoms on different values of principal quantum number n, i.e. n = 30-60, at an initial electron temperature of 3.3 K are also investigated. The main experimental results are approximately explained by the three-body recombination theory.

关键词： recombination ultracold plasma Rydberg atoms

Absorption of laser radiation in ultracold plasma

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Chinese Physics B 2016年第10期25卷 128-131页

作者： N Y Shaparev Institute of Computational Modeling Russian Academy of Sciences National Research Tomsk State University

In this paper, we analyze the spectral behavior(optical thickness, shape and linewidth) of laser radiation absorption under the correlation heating of ions in an ultracold plasma. The Voigt formula is used to find the absorption *** spectral line width is shown to grow with time while the optical thickness reduces. Our modeling results are in good agreement with the experimental findings reported in the literature.

关键词： absorption laser radiation ultracold plasma