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国家自然科学基金(61008012)

作品数:13 被引量:3H指数:1
相关作者:汪丽蓉马杰肖连团贾锁堂赵延霆更多>>
相关机构:山西大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划山西省自然科学基金更多>>
相关领域:理学机械工程更多>>

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13 条 记 录,以下是 1-10
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Investigation of ultracold atoms and molecules in a dark magneto-optical trap
2012年
In this paper, ultracold atoms and molecules in a dark magneto-optical trap (MOT) are studied via depumping the cesium cold atoms into the dark hyperfine ground state. The collision rate is reduced to 0.45 s-1 and the density of the atoms is increased to 5.6 × 1011 cm-3 when the fractional population of the atoms in the bright hyperfine ground state is as low as 0.15. The vibrational spectra of the ultracold cesium molecules are also studied in a standard MOT and in a dark MOT separately. The experimental results are analyzed by using the perturbative quantum approach.
汪丽蓉姬中华元晋鹏杨艳赵延霆马杰肖连团贾锁堂
关键词:PHOTOASSOCIATION
A direct frequency comb for two-photon transition spectroscopy in a cesium vapor
2012年
A phase-stabilized femtosecond frequency comb is used to measure high-resolution spectra of two-photon transition 62S1/2-62P1/2,3/2-82S1/2 in a cesium vapor. The broadband laser output from a femtosecond frequency comb is split into counter-propagating parts, shaped in an original way, and focused into a room-temperature cesium vapor. We obtain high-resolution two-photon spectroscopy by scanning the repetition rate of femtosecond frequency comb, and through absolute frequency measurements.
张一驰武寄洲李玉清金丽马杰汪丽蓉赵延霆肖连团贾锁堂
超冷铯分子纯长程态转动常数的精密测量
2013年
利用调制的俘获损耗光谱技术实验测量了超冷铯分子纯长程0g态的高分辨光谱.采用双光缔合光谱技术构建了精确的频率差参考信号,对转动能级的共振频率间隔进行了精确的标定,获得了转动能级频率间隔与转动量子数的关系.通过将实验数据拟合到非刚性转动模型,获得了超冷铯分子纯长程0g态不同振动态的转动常数.实验结果表明转动常数随振动量子数的增加而线性减小,线性递减率为0.41 MHz±0.01 MHz.
马杰陈鹏刘文良冯国胜李玉清武寄洲肖连团贾锁堂
The laser-intensity dependence of the photoassociation spectrum of the ultracold Cs_2(6S_(1/2) + 6P_(1/2))0_u^+ long-range molecular state
2013年
The high-resolution photoassociation spectrum of the ultracold cesium molecular 0+ state below the 6S1/2 + 6PI/2 limit is presented in this paper. The saturation of the photoassociation scattering probability is observed from the depen dence of the trap-loss probability on the photoassociation laser intensity. The corresponding resonant line width is also demonstrated to increase linearly with increasing photoassociation laser intensity. Our experimental data have good con sistency with the theoretical saturation model of Bohn and Julienne [Bohn J L and Julienne P S 1999 Phys. Rev. A 60 1].
金丽冯国胜武寄洲马杰汪丽蓉肖连团贾锁堂
High sensitive detection of high-order partial wave scattering in photoassociation of ultralcold atoms
2012年
We report on the observation of enhanced high-order partial wave scattering from atom atom interaction via changing the temperature of a magneto optical trap in the process of photoassociation. The high-order scattering partial wave is directly manifested through the large signal amplitude of the rovibrational resonance levels of trap-loss spectroscopy from photoassociation.
李玉清马杰武寄洲张一驰赵延霆汪丽蓉肖连团贾锁堂
关键词:PHOTOASSOCIATION
飞秒频率梳和单频激光干涉光谱的实验研究被引量:1
2015年
本文研究了光学频率梳输出的整形后飞秒脉冲激光和单频激光的干涉光谱。实验中光学频率梳和单频激光干涉的信号包括直流项、光学频率梳输出的脉冲激光相邻模式之间的干涉项和光学频率梳脉冲激光与单频激光之间的干涉项。实验上研究了光学频率梳脉冲激光与单频激光干涉信号间距和单频激光频率的关系,提供了一种快速直接测量单频激光频率的有效方法。研究了光学频率梳输出的飞秒脉冲光经过铷泡后与单频激光干涉信号和单频激光频率的关系,获得铷原子吸收光谱。该研究工作对于原子分子高精密光谱测量具有一定的意义。
向少山张一弛曹书凯汪丽蓉
关键词:飞秒脉冲
Photoassociative Production and Detection of Ultracold Polar RbCs Molecules
2011年
We have produced ultracold polar RbCs molecules via photoassociation starting from laser-cooled 85Rb and 133Cs atoms in a dual−species,forced dark magneto-optical trap.The formed electronically excited RbCs∗molecules correlated to the Rb(5S_(1/2))+Cs(6P_(1/2))dissociation limit are observed by trap loss spectroscopy.Following the decay of these excited RbCs*molecules,the formed ground state molecules are directly ionized by a two-photon single-color pulse dye laser,which is a new ionization mechanism for ground state RbCs molecules and thence detected by time-of-flight mass spectroscopy.
JI Zhong-HuaZHANG Hong-ShanWU Ji-ZhouYUAN Jin-PengZHAO Yan-TingMA JieWANG Li-RongXIAO Lian-TuanJIA Suo-Tang
关键词:EXCITEDASSOCIATIVE
超冷铷铯极性分子振转光谱的实验研究
2012年
利用激光冷却俘获技术在双暗磁光阱中获得高密度的超冷铷原子和铯原子,通过光缔合方法制备超冷铷铯极性分子.采用共振增强双光子电离技术探测基三重态a^3∑^+的铷铯分子,产率约为10~4/s.通过改变缔合光频率,获得(2)0^+,(3)0^-,(2)0^-等分子态的高分辨振转光谱,拟合得到相应的转动常数分别为0.00349 cm^(-1),0.00649 cm^(-1),0.00372 cm^(-1).
杨艳姬中华元晋鹏汪丽蓉赵延霆马杰肖连团贾锁堂
关键词:振转光谱
Precise measurement of the line width of the photoassociation spectra of ultracold molecules by using a frequency shifter
2012年
We propose a technique to precisely measure the line width of the photoassociation spectra of the excited cesium molecule by using a frequency shifter to generate two laser beams with a precise frequency difference. A series of photoassociation (PA) spectra are recorded with two laser beam induced molecular lines, whose peak separation serves as an accurate frequency ruler to measure the line width of the PA spectra. The full width half maximum line width was studied as a function of PA laser intensity. The extrapolated value at zero laser intensity is (34.8± 0.22) MHz. By analyzing other broadening mechanisms, a value of (32.02 ± 0.70) MHz was deduced. It is shown that this scheme is inexpensive, simple, robust, and is promising for applications in a variety of other atomic species.
武寄洲马杰姬中华张一驰李玉清汪丽蓉赵延霆肖连团贾锁堂
Reanalysis of the photoassociation spectrum of ^(133)Cs_2 (6P_(3/2)) 1_g state
2013年
Reanalysis of the photoassociation spectrum of the weakly binding (6S1/2 + 6P3/2) lg 133Cs2 levels, reported in the previous study [J. Mol. Spectro. 255 (2009) 106], is performed by using a Lu-Fano graph coupled to the improved LeRoy- Bernstein formula including two additional modified terms. A more accurate coefficient (c3) is obtained for the leading long-range potential (-c3/R3) of a diatomic molecule.
马杰李玉清武寄洲樊群超冯灏孙卫国肖连团贾锁堂
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