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High-resolution photoassociation spectroscopy of ultracold Cs_2 long-range 0_g~- state: The external well potential depth

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Chinese Physics B 2014年第1期23卷 197-200页

作者：刘文良武寄洲马杰肖连团贾锁堂 State Key Laboratory of Quantum Optics and Quantum Optics Devices Laser Spectroscopy Laboratory Shanxi University Taiyuan 030006 China

High-resolution photoassociation spectroscopy is reported using a modulation spectroscopy technology in a cesium atomic magneto-optical trap. The two lowest vibrational levels have been experimentally observed which have been theo- retically predicted in [Phys. Rev. A 75 052501 （2007）]. A new potential curve is obtained by using the Rydberg-Klein-Ress method with a well depth of -82,384 ＋ 0,026 cm-1, which is deeper than the result of previous experiment （-77.909 cm-1） and the theoretical prediction （-81.6445 cm- l ）.

关键词： ultracold molecules photoassociation trap-loss spectroscopy potential depth

High resolution photoassociation spectra of an ultracold Cs_2 long-range 0_u^+ (6S_(1/2)+6P_(1/2) ) state

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Chinese Physics B 2013年第9期22卷 376-380页

作者：陈鹏李玉清张一驰武寄洲马杰肖连团贾锁堂 State Key Laboratory of Quantum Optics and Quantum Optics Devices Laser Spectroscopy LaboratoryShanxi University

In this paper, ultracold cesium molecules are formed through photoassociation technology, which is carried out in a magneto-optical trap. High resolution photoassociaion spectra with the rotational progressions up to J = 7 are obtained. Three rovibrational levels of the long-range 0＋ state of Cs2 below the （6S1/2 ＋ 6P1/2） dissociation limit are specifically investigated. By fitting their binding energy intervals to the non-rigid rotational model, the rotational constant of the long- range 0u＋ state is determined. A proportional dependence of the value of the rotational constant on the vibrational quantum number is demonstrated.

关键词： ultracold molecules photoassociation trap-loss spectrum long-range molecular coefficient

Suppressing the weakly bound states in the photoassociation dynamics by using a frequency cut-off laser pulse

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Chinese Physics B 2012年第7期21卷 257-261页

作者：林峰张为赵泽宇丛书林 School of Physics and Optoelectronic Technology Dalian University of Technology

The photoassociation dynamics of ultracold lithium atoms controlled by a cut-off pulse has been investigated theoretically by solving numerically the time-dependent Schr6dinger equation using the mapped Fourier grid method. The frequency components of the laser pulse close to the atomic resonance are partly cut off. Compared with the typical Gauss-type pulses, the cut-off pulse is helpful to suppress efficiently the weakly bound states and prepare the associated molecules in the lower vibrational states. Especially, the dependence of photoassociation probability on the cut-off position of the laser pulse is explored.

关键词： photoassociation cut-off laser pulse ultracold molecules