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

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

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.

Keywords: Stark deceleration molecular beams cold molecules

Received: 05 January 2019
Revised: 08 March 2019
Accepted manuscript online:

PACS:	37.20.+j	(Atomic and molecular beam sources and techniques)
	37.10.Mn	(Slowing and cooling of molecules)
	32.60.+i	(Zeeman and Stark effects)

Fund: 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).

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

Cite this article:

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 2019 Chin. Phys. B 28 053701

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

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