Apparatus for Trapping and Spectroscopy of Atoms

原子捕获和光谱分析装置

• 批准号: 460938875
• 金额: --
• 依托单位: Johannes Gutenberg-Universität Mainz
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/460938875?language=en
• 关键词: Apparatus; Trapping; Spectroscopy; Atoms

Our main goal is the laser spectroscopy of trapped hydrogen (H), deuterium (T), tritium (T) and lithium-6 and -7 (Li). These precise measurements with an accuracy of better than 1 kHz yield the isotope shift, which can be used to determine the difference of the nuclear charge radii.For tritium, this will lead to a 400fold improved value of the triton charge radius. For this, one needs cold, magnetically trapped T atoms. Hydrogen and Antihydrogen have already been trapped, and laser spectroscopy with the envisaged precision has been performed. The methods employed there, however, can not be applied to tritium. We therefore plan to cool and trap of H, D, and later T using an ultra-dense cloud of cold Li atoms, trapped in a magneto-optical trap (MOT).To this end, we have already built a MOT setup for Li and another apparatus which produces a cryogenic beam of H atoms. Both, cold Li and cold H can now be subjected to laser spectroscopy, using our existing laser systems.The main missing ingredient is a device for precise measurement and control of our lasers (frequency comb). This will enable us to find the well-known 1S-2S resonance in atomic hydrogen, and to optimize the H apparatus. Then we plan to embed the Li apparatus into our H apparatus, to be able to cool and trap the H atoms using the cold Li gas. We then plan to perform spectroscopy in H and D and, by comparison with the 100fold better measured literature values, study the systematic effects originating from our trap and the Li MOT. Finally, we plan to trap and measure T atoms, resulting in a 400fold improved charge radius of the triton.The requested frequency comb will also used at the Li MOT apparatus to measure the Li-6/7 isotope shift using cold Li for the first time, yielding superior precision. Finally, the frequency comb will help us calibrate a laser being developed for the laser spectroscopy of muonic hydrogen which should yield a 100fold improved value of the magnetic "Zemach"-radius of the proton.The overarching goal of all of these experiments in my group are the measurements of nuclear observables (charge radii, their differences, and magnetic radii) of the lightest nuclei using laser spectroscopy of light atoms.

我们的主要目标是捕获氢（H），氘（T），氚（T）和锂-6和-7（Li）的激光光谱学。这些精确测量的精度优于1 kHz，产生的同位素位移，可以用来确定核电荷半径的差异，对于氚，这将导致400倍的改进值的triton电荷半径。为此，我们需要冷的、被磁捕获的T原子。氢和反氢已经被捕获，并且已经进行了具有预期精度的激光光谱学。然而，那里采用的方法不能应用于氚。因此，我们计划使用磁光阱（MOT）中捕获的超致密冷Li原子云来冷却和捕获H，D，以及随后的T。为此，我们已经为Li和另一个产生低温H原子束的装置建立了MOT装置。现在，冷Li和冷H都可以使用我们现有的激光系统进行激光光谱分析。主要缺少的成分是用于精确测量和控制我们激光器的设备（频率梳）。这将使我们能够找到著名的1 S-2S共振氢原子，并优化H装置。然后，我们计划将Li装置嵌入到我们的H装置中，以便能够使用冷Li气体冷却和捕获H原子。然后，我们计划在H和D中进行光谱分析，并通过与100倍更好的测量文献值进行比较，研究源于我们的陷阱和Li MOT的系统效应。最后，我们计划捕获和测量T原子，使triton的电荷半径提高400倍。所要求的频率梳也将用于Li MOT装置，首次使用冷Li测量Li-6/7同位素位移，产生上级精度。最后，频率梳将帮助我们校准正在开发的用于μ子氢激光光谱的激光器，这将使质子的磁“泽马赫”半径值提高100倍。我小组所有这些实验的首要目标是使用轻原子的激光光谱测量最轻原子核的核可观测量（电荷半径、电荷半径差和磁半径）。