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Search Results: 1 - 10 of 28801 matches for " Jia Suo-Tang "
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Sub-natural linewidth of the probe absorption spectrum in a cold Cs atom molecule system

Feng Zhi-Fang,Li Wei-Dong,Xiao Lian-Tuan,Jia Suo-Tang,

中国物理 B , 2009,
Creation of an Ultracold Plasma by Photoionizing Laser-Cooled Caesium Atom

JING Qun,FENG Zhi-Gang,ZHANG Lin-Jie,LI Chang-Yong,ZHAO Jian-Ming,JIA Suo-Tang,

中国物理快报 , 2008,
Abstract: The signals of ultracold plasma are observed by two-photon ionization of laser-cooled atom in a caesium magneto-optical trap. A simple model has been introduced to explain the creation of plasma, and the mechanism is further investigated by changing the energy of a pulsed dye laser and the number of initial cooled atoms.
Experimental Research of Spontaneous Evolution from Ultracold Rydberg Atoms to Plasma

ZHANG Lin-Jie,FENG Zhi-Gang,LI An-Ling,ZHAO Jian-Ming,LI Chang-Yong,JIA Suo-Tang,

中国物理快报 , 2008,
Abstract: The spontaneous evolution from ultracold Rydberg atoms to plasma is investigated in a caesium MOT by using the method of field ionization. The plasma transferred from atoms in different Rydberg states (n=22--32) are obtained experimentally. Dependence of the threshold time of evolving toplasma and the threshold number of initial Rydberg atoms on the principal quantum number of initial Rydberg states is studied. The experimental results are in agreement with hot--cold Rydberg--Rydberg atom collision ionization theory.

Xiao Lian-tuan,Zhao Jian-ming,Li Chang-yong,Jia Suo-tang,Zhou Guo-sheng,

中国物理 B , 2001,
Recombination during expansion of ultracold plasma

Zhao Jian-Ming,Zhang Lin-Jie,Feng Zhi-Gang,Li Chang-Yong,Jia Suo-Tang,

中国物理 B , 2010,
Abstract: Signals of ultracold plasma are observed by two-photon ionization of laser-cooled caesium atoms in a magneto-optical 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 ($ \sim $10$^{10}$~cm$^{ - 3})$ are investigated. The measured dependence on initial ion density is $N^{1.547\pm 0.004}$ at a delay time of 5~$\mu $s. 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.
Measurement of quantum defect of nS and nD states using field ionization spectroscopy in ultracold cesium atoms

Zhang Lin-Jie,Feng Zhi-Gang,Li An-Ling,Zhao Jian-Ming,Li Chang-Yong,Jia Suo-Tang,

中国物理 B , 2009,
Abstract: This paper reports that ultracold atoms are populated into different $n$S and $n$D Rydberg states ($n$=25$\sim $52) by two-photon excitation. The ionization spectrum of an ultracold Rydberg atom is acquired in a cesium magneto-optical trap by using the method of pulse field ionization. This denotes $n$S and $n$D states in the ionization spectrum and fits the data of energy levels of different Rydberg states to obtain quantum defects of $n$S and $n$D states.
Direct measurement of the surface dynamics of supercooled liquid-glycerol by optical scanning a film

Zhang Fang,Zhang Guo-Feng,Dong Shuang-Li,Sun Jian-Hu,Chen Rui-Yun,Xiao Lian-Tuan,Jia Suo-Tang,

中国物理 B , 2009,
Abstract: The surface dynamics of supercooled liquid-glycerol is studied by scanning the thickness of the glycerol film with single photon detection. Measurements are performed at room temperature well above the glycerol's glass transition temperature. It is shown that the surface dynamics of the glycerol film is very sensitive to the temperature. The linear relationship between the thickness of the film and the viscosity predicted by the Vogel--Fulcher--Tammann--Hesse (VFTH) law is also presented experimentally.
Theoretical analysis of cavity saturation spectroscopy of weak molecular absorbance
Ma Wei-Guang,Dong Lei,Yin Wang-Bao,Jia Suo-Tang,
,董 磊,尹王保,贾锁堂

中国物理 B , 2005,
Abstract: A theoretical analysis of sub-Doppler molecular saturation spectroscopy by use of a confocal Fabry--Perot (CFP) cavity is presented. The effects of gas pressure, cavity length and mirror reflectivity on the saturation dip amplitude are analysed. Such a treatment can provide the optimum conditions and a guidance for the experiment of saturating the weak molecular absorption lines.


中国物理 B , 1996,
Photon counts modulation in optical time domain reflectometry

Wang Xiao-Bo,Wang Jing-Jing,Zhang Guo-Feng,Xiao Lian-Tuan,Jia Suo-Tang,

中国物理 B , 2011,
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