Generation of high-energy-resolved NH3 molecular beam by a Stark decelerator with 179 stages

doi:10.1088/1674-1056/28/5/053701

中国物理B ›› 2019, Vol. 28 ›› Issue (5): 53701-053701.doi: 10.1088/1674-1056/28/5/053701

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Generation of high-energy-resolved NH₃ molecular beam by a Stark decelerator with 179 stages

Bin Wei(魏斌), Shunyong Hou(侯顺永), Hengjiao Guo(郭恒娇), Yabing Ji(纪亚兵), Shengqiang Li(李胜强), Jianping Yin(印建平)

1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China;
2 School of New Energy and Electronic Engineering, Yancheng Teachers University, Yancheng 224051, China

收稿日期:2019-01-05 修回日期:2019-03-08 出版日期:2019-05-05 发布日期:2019-05-05
通讯作者: Jianping Yin E-mail:jpyin@phy.ecnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 91536218, 11034002, 11274114, 11504112, and 11504318), the National Basic Research Program of China (Grant No. 2011CB921602), the Fundamental Research Funds for the Central Universities, China, Shanghai Pujiang Talents Plan, China (Grant No. 18PJ1403100), and Exploration Funds for the Shanghai Natural Science Foundation, China (Grant No. 18ZR1412700).

Generation of high-energy-resolved NH₃ molecular beam by a Stark decelerator with 179 stages

Bin Wei(魏斌)¹, Shunyong Hou(侯顺永)¹, Hengjiao Guo(郭恒娇)¹, Yabing Ji(纪亚兵)¹, Shengqiang Li(李胜强)², Jianping Yin(印建平)¹

1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China;
2 School of New Energy and Electronic Engineering, Yancheng Teachers University, Yancheng 224051, China

Received:2019-01-05 Revised:2019-03-08 Online:2019-05-05 Published:2019-05-05
Contact: Jianping Yin E-mail:jpyin@phy.ecnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 91536218, 11034002, 11274114, 11504112, and 11504318), the National Basic Research Program of China (Grant No. 2011CB921602), the Fundamental Research Funds for the Central Universities, China, Shanghai Pujiang Talents Plan, China (Grant No. 18PJ1403100), and Exploration Funds for the Shanghai Natural Science Foundation, China (Grant No. 18ZR1412700).

摘要/Abstract

摘要： We demonstrate the production of cold, slow NH₃ molecules from a supersonic NH₃ molecular beam using our electrostatic Stark decelerator consisting of 179 slowing stages. By using this long Stark decelerator, a supersonic NH₃ molecular beam can be easily decelerated to trappable velocities. Here we present two modes for operating the Stark decelerator to slow the supersonic NH₃ molecules. The first is the normal mode, where all 179 stages are used to decelerate molecules, and it allows decelerating the NH₃ molecular beam from 333 m/s to 18 m/s, with a final temperature of 29.2 mK. The second is the deceleration-bunch mode, which allows us to decelerate the supersonic NH₃ beam from 333 m/s to 24 m/s, with a final temperature of 2.9 mK. It is clear that the second mode promises to produce colder (high-energy-resolution) molecular samples than the normal mode. Three-dimensional Monte Carlo simulations are also performed for the experiments and they show a good agreement with the observed results. The deceleration-bunch operation mode presented here can find applications in the fields of cold collisions, high-resolution spectroscopy, and precision measurements.

关键词: Stark deceleration, molecular beams, cold molecules

Abstract: We demonstrate the production of cold, slow NH₃ molecules from a supersonic NH₃ molecular beam using our electrostatic Stark decelerator consisting of 179 slowing stages. By using this long Stark decelerator, a supersonic NH₃ molecular beam can be easily decelerated to trappable velocities. Here we present two modes for operating the Stark decelerator to slow the supersonic NH₃ molecules. The first is the normal mode, where all 179 stages are used to decelerate molecules, and it allows decelerating the NH₃ molecular beam from 333 m/s to 18 m/s, with a final temperature of 29.2 mK. The second is the deceleration-bunch mode, which allows us to decelerate the supersonic NH₃ beam from 333 m/s to 24 m/s, with a final temperature of 2.9 mK. It is clear that the second mode promises to produce colder (high-energy-resolution) molecular samples than the normal mode. Three-dimensional Monte Carlo simulations are also performed for the experiments and they show a good agreement with the observed results. The deceleration-bunch operation mode presented here can find applications in the fields of cold collisions, high-resolution spectroscopy, and precision measurements.

Key words: Stark deceleration, molecular beams, cold molecules

中图分类号: (Atomic and molecular beam sources and techniques)

37.20.+j

37.10.Mn (Slowing and cooling of molecules) 32.60.+i (Zeeman and Stark effects)

魏斌, 侯顺永, 郭恒娇, 纪亚兵, 李胜强, 印建平. Generation of high-energy-resolved NH₃ molecular beam by a Stark decelerator with 179 stages[J]. 中国物理B, 2019, 28(5): 53701-053701.

Bin Wei(魏斌), Shunyong Hou(侯顺永), Hengjiao Guo(郭恒娇), Yabing Ji(纪亚兵), Shengqiang Li(李胜强), Jianping Yin(印建平). Generation of high-energy-resolved NH₃ molecular beam by a Stark decelerator with 179 stages[J]. Chin. Phys. B, 2019, 28(5): 53701-053701.

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Generation of high-energy-resolved NH₃ molecular beam by a Stark decelerator with 179 stages

Generation of high-energy-resolved NH₃ molecular beam by a Stark decelerator with 179 stages

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