Stark-potential evaporative cooling of polar molecules in a novel optical-access opened electrostatic trap

doi:10.1088/1674-1056/24/11/113101

中国物理B ›› 2015, Vol. 24 ›› Issue (11): 113101-113101.doi: 10.1088/1674-1056/24/11/113101

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Stark-potential evaporative cooling of polar molecules in a novel optical-access opened electrostatic trap

孙慧, 王振霞, 王琴, 李兴佳, 刘建平, 印建平

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

收稿日期:2015-04-28 修回日期:2015-07-08 出版日期:2015-11-05 发布日期:2015-11-05
通讯作者: Yin Jian-Ping E-mail:jpyin@phy.ecnu.edu.cn

Stark-potential evaporative cooling of polar molecules in a novel optical-access opened electrostatic trap

Sun Hui (孙慧), Wang Zhen-Xia (王振霞), Wang Qin (王琴), Li Xing-Jia (李兴佳), Liu Jian-Ping (刘建平), Yin Jian-Ping (印建平)

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

Received:2015-04-28 Revised:2015-07-08 Online:2015-11-05 Published:2015-11-05
Contact: Yin Jian-Ping E-mail:jpyin@phy.ecnu.edu.cn

摘要/Abstract

摘要： We propose a novel optical-access opened electrostatic trap to study the Stark-potential evaporative cooling of polar molecules by using two charged disk electrodes with a central hole of radius r₀=1.5 mm, and derive a set of new analytical equations to calculate the spatial distributions of the electrostatic field in the above charged-disk layout. Afterwards, we calculate the electric-field distributions of our electrostatic trap and the Stark potential for cold ND₃ molecules, and analyze the dependences of both the electric field and the Stark potential on the geometric parameters of our charged-disk scheme, and find an optimal condition to form a desirable trap with the same trap depth in the x, y, and z directions. Also, we propose a desirable scheme to realize an efficient loading of cold polar molecules in the weak-field-seeking states, and investigate the dependences of the loading efficiency on both the initial forward velocity of the incident molecular beam and the loading time by Monte Carlo simulations. Our study shows that the maximal loading efficiency of our trap scheme can reach about 95%, and the corresponding temperature of the trapped cold molecules is about 28.8 mK. Finally, we study the Stark-potential evaporative cooling for cold polar molecules in our trap by the Monte Carlo method, and find that our simulated evaporative cooling results are consistent with our developed analytical model based on trapping-potential evaporative cooling.

关键词: evaporative cooling, electrostatic trap, Monte Carlo simulations

Abstract: We propose a novel optical-access opened electrostatic trap to study the Stark-potential evaporative cooling of polar molecules by using two charged disk electrodes with a central hole of radius r₀=1.5 mm, and derive a set of new analytical equations to calculate the spatial distributions of the electrostatic field in the above charged-disk layout. Afterwards, we calculate the electric-field distributions of our electrostatic trap and the Stark potential for cold ND₃ molecules, and analyze the dependences of both the electric field and the Stark potential on the geometric parameters of our charged-disk scheme, and find an optimal condition to form a desirable trap with the same trap depth in the x, y, and z directions. Also, we propose a desirable scheme to realize an efficient loading of cold polar molecules in the weak-field-seeking states, and investigate the dependences of the loading efficiency on both the initial forward velocity of the incident molecular beam and the loading time by Monte Carlo simulations. Our study shows that the maximal loading efficiency of our trap scheme can reach about 95%, and the corresponding temperature of the trapped cold molecules is about 28.8 mK. Finally, we study the Stark-potential evaporative cooling for cold polar molecules in our trap by the Monte Carlo method, and find that our simulated evaporative cooling results are consistent with our developed analytical model based on trapping-potential evaporative cooling.

Key words: evaporative cooling, electrostatic trap, Monte Carlo simulations

中图分类号: (Calculations and mathematical techniques in atomic and molecular physics)

31.15.-p

37.10.Mn (Slowing and cooling of molecules) 37.10.Pq (Trapping of molecules)

孙慧, 王振霞, 王琴, 李兴佳, 刘建平, 印建平. Stark-potential evaporative cooling of polar molecules in a novel optical-access opened electrostatic trap[J]. 中国物理B, 2015, 24(11): 113101-113101.

Sun Hui (孙慧), Wang Zhen-Xia (王振霞), Wang Qin (王琴), Li Xing-Jia (李兴佳), Liu Jian-Ping (刘建平), Yin Jian-Ping (印建平). Stark-potential evaporative cooling of polar molecules in a novel optical-access opened electrostatic trap[J]. Chin. Phys. B, 2015, 24(11): 113101-113101.

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Stark-potential evaporative cooling of polar molecules in a novel optical-access opened electrostatic trap

Stark-potential evaporative cooling of polar molecules in a novel optical-access opened electrostatic trap

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