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Chin. Phys. B, 2022, Vol. 31(10): 103201    DOI: 10.1088/1674-1056/ac720c

Formation of high-density cold molecules via electromagnetic trap

Ya-Bing Ji(纪亚兵)1, Bin Wei(魏斌)2, Heng-Jiao Guo(郭恒娇)1, Qing Liu(刘青)1, Tao Yang(杨涛)1,3, Shun-Yong Hou(侯顺永)1,†, and Jian-Ping Yin(印建平)1,‡
1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China;
2. Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China;
3. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
Abstract  Preparation and control of cold molecules are advancing rapidly, motivated by many exciting applications ranging from tests of fundamental physics to quantum information processing. Here, we propose a trapping scheme to create high-density cold molecular samples by using a combination of electric and magnetic fields. In our theoretical analysis and numerical calculations, a typical alkaline-earth monofluoride, MgF, is used to test the feasibility of our proposal. A cold MgF molecular beam is first produced via an electrostatic Stark decelerator and then loaded into the proposed electromagnetic trap, which is composed of an anti-Helmholtz coil, an octupole, and two disk electrodes. Following that, a huge magnetic force is applied to the molecular sample at an appropriate time, which enables further compressing of the spatial distribution of the cold sample. Molecular samples with both higher number density and smaller volume are quite suitable for the laser confinement and other molecular experiments such as cold collisions in the next step.
Keywords:  Stark effect      Zeeman effect      cold molecules  
Received:  02 April 2022      Revised:  15 May 2022      Accepted manuscript online: 
PACS:  32.60.+i (Zeeman and Stark effects)  
  37.10.Pq (Trapping of molecules)  
  37.10.Mn (Slowing and cooling of molecules)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 91536218, 11874151, and 11834003), the Fundamental Research Funds for the Central Universities, China, the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, China, and the Young Top-Notch Talent Support Program of Shanghai, China.
Corresponding Authors:  Shun-Yong Hou, Jian-Ping Yin     E-mail:;

Cite this article: 

Ya-Bing Ji(纪亚兵), Bin Wei(魏斌), Heng-Jiao Guo(郭恒娇), Qing Liu(刘青), Tao Yang(杨涛), Shun-Yong Hou(侯顺永), and Jian-Ping Yin(印建平) Formation of high-density cold molecules via electromagnetic trap 2022 Chin. Phys. B 31 103201

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