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Sympathetic cooling of cold molecules

冷分子的交感冷却

基本信息

批准号：
1925385
负责人：
金额：
--
依托单位：
Durham University
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2017
资助国家：
英国
起止时间：
2017 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1925385
关键词：
Sympathetic cooling cold molecules

项目摘要

The student is conducting experimental research in the EPSRC-recognised area of Cold Atoms and Molecules. Specifically, he is researching how to achieve sympathetic cooling of a gas of molecules into the ultracold regime through thermal contact with a much colder gas of laser cooled atoms. In order to do this, both molecular and atomic gases must be trapped in the same region of space. Unfortunately, the natural outcome of such contact between the two gases is for a chemical reaction to take place or for the molecule to change quantum state, in other words - chemistry happens. Chemistry is undesirable in this context as it leads to the molecules being lost. However, the intriguing research question is - can the chemistry be controlled?The student will be working on the further development of a machine called a moving-trap Zeeman decelerator that can be used to load a novel magnetic trap, which he is also developing, with atoms and molecules. The novelty of the trap is that its magnetic-field profile has been tailored so as to allow, not only magnetic confinement of both gases, but the laser cooling of the atoms. It has also been designed such that the quantum state of the atoms and molecules can be manipulated by optical pumping. PW will research how to use the magnetic fields and the optical pumping to switch off the chemistry in the trap so as to allow sympathetic cooling to occur unhindered.

这名学生正在进行EPSRC识别的冷原子和分子区域的实验研究。具体地说，他正在研究如何通过与更冷的激光冷却原子气体进行热接触，实现分子气体进入超低温状态的交感冷却。为了做到这一点，分子气体和原子气体必须被困在同一空间区域。不幸的是，这两种气体接触的自然结果是发生化学反应或分子改变量子态，换句话说，化学发生了。在这种情况下，化学是不可取的，因为它会导致分子丢失。然而，令人感兴趣的研究问题是--化学能被控制吗？这位学生将致力于进一步开发一种名为移动陷阱塞曼减速器的机器，该机器可以用来加载他也在开发的新型磁陷阱，其中包括原子和分子。这种陷阱的新奇之处在于，它的磁场轮廓经过了调整，不仅可以对两种气体进行磁限制，还可以对原子进行激光冷却。它还被设计成可以通过光学泵浦来操纵原子和分子的量子态。PW将研究如何使用磁场和光泵浦来关闭陷阱中的化学物质，以便使交感冷却不受阻碍地发生。