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

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

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.

Keywords: evaporative cooling electrostatic trap Monte Carlo simulations

Received: 28 April 2015
Revised: 08 July 2015
Accepted manuscript online:

PACS:	31.15.-p	(Calculations and mathematical techniques in atomic and molecular physics)
	37.10.Mn	(Slowing and cooling of molecules)
	37.10.Pq	(Trapping of molecules)

Corresponding Authors: Yin Jian-Ping
E-mail: jpyin@phy.ecnu.edu.cn

Cite this article:

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 2015 Chin. Phys. B 24 113101

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

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