Optimal beam sources for Stark decelerators in collision experiments: a tutorial review.

IF 1 Q4 INSTRUMENTS & INSTRUMENTATION
EPJ Techniques and Instrumentation Pub Date : 2015-01-01 Epub Date: 2015-08-06 DOI:10.1140/epjti/s40485-015-0021-y
Sjoerd N Vogels, Zhi Gao, Sebastiaan Yt van de Meerakker
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引用次数: 11

Abstract

With the Stark deceleration technique, packets of molecules with a tunable velocity, a narrow velocity spread, and a high state purity can be produced. These tamed molecular beams find applications in high resolution spectroscopy, cold molecule trapping, and controlled scattering experiments. The quality and purity of the packets of molecules emerging from the decelerator critically depend on the specifications of the decelerator, but also on the characteristics of the molecular beam pulse with which the decelerator is loaded. We consider three frequently used molecular beam sources, and discuss their suitability for molecular beam deceleration experiments, in particular with the application in crossed beam scattering in mind. The performance of two valves in particular, the Nijmegen Pulsed Valve and the Jordan Valve, is illustrated by decelerating ND 3 molecules in a 2.6 meter-long Stark decelerator. We describe a protocol to characterize the valve, and to optimally load the pulse of molecules into the decelerator. We characterize the valves regarding opening time duration, optimal valve-to-skimmer distance, mean velocity, velocity spread, state purity, and relative intensity.

Abstract Image

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碰撞实验中Stark减速器的最佳光束源:教程回顾。
使用Stark减速技术,可以产生具有可调速度、窄速度分布和高状态纯度的分子包。这些驯服的分子束在高分辨率光谱,冷分子捕获和控制散射实验中得到应用。从减速器中产生的分子包的质量和纯度主要取决于减速器的规格,但也取决于装载减速器的分子束脉冲的特性。我们考虑了三种常用的分子束源,并讨论了它们在分子束减速实验中的适用性,特别是在交叉束散射中的应用。通过在2.6米长的Stark减速器中减速ND - 3分子,Nijmegen脉冲减速器和Jordan减速器这两种减速器的性能得到了特别的说明。我们描述了一种协议来表征阀门,并以最佳方式将分子脉冲加载到减速器中。我们描述了阀门的开启时间、最佳阀门到撇油器的距离、平均流速、流速扩散、状态纯度和相对强度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
EPJ Techniques and Instrumentation
EPJ Techniques and Instrumentation INSTRUMENTS & INSTRUMENTATION-
自引率
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发文量
11
审稿时长
13 weeks
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