Precision spectroscopy of highly excited states in hydrogen atom

氢原子高激发态的精密光谱

• 批准号: 246768663
• 负责人: Professor Dr. Theodor W. Hänsch
• 金额: --
• 依托单位: Lehrstuhl für Experimentalphysik - Laserspektroskopie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/246768663?language=en
• 关键词: Precision; spectroscopy; highly; excited; states

Joint German-Russian project aims at precise determination of the optical frequencies of the 2S-4P, 2S-6P and 2S-9P transitions in atomic hydrogen. In combination with previously measured 1S-2S frequency this allows to determine the proton charge radius and the Rydberg constant. A new value for the proton charge radius is of significant importance due to discrepancy between measurements in atomic hydrogen and recent Lamb shift measurement in muonic hydrogen. Solving this (proton charge radius puzzle) may result in more accurate value for the Rydberg constant. We plan to design new ultra-stable laser systems for excitation of the electric dipole transitions 2S-4P, 2S-6P and 2S-10P and measure transition frequencies with a target uncertainty of less than 3 kHz (spectral resolution of 1E12). To reach the desired uncertainty corresponding to 1E-4 of the line width we plan to extensively study excitation process and systematic effects such as Doppler effect, optical pumping, Stark shift and others. Along with absolute measurements of the number of transition frequencies (2S1/2-4P1/2, 3/2, 2S1/2-6P1/2,3/2, 2S1/2-9P1/2, 3/2), a detailed theoretical study of the line shape and contributions of systematic frequency shifts is planned.

联合德国 - 俄罗斯项目旨在精确确定原子氢中2s-4p，2s-6p和2s-9p跃迁的光频率。结合先前测量的1S-2S频率，这允许确定质子电荷半径和Rydberg常数。质子电荷半径的新值非常重要，这是由于原子氢的测量与muonic氢中最近的羔羊移位测量之间的差异。求解此（质子电荷半径拼图）可能会导致Rydberg常数更准确的值。我们计划设计新的超稳定激光系统，以激发电偶极转换2s-4p，2s-6p和2s-10p，并测量靶向不确定性小于3 kHz的过渡频率（光谱分辨率为1E12）。为了达到与线宽度1E-4相对应的所需不确定性，我们计划广泛研究激发过程和系统效应，例如多普勒效应，光学泵送，鲜明的偏移等。以及过渡频率数量的绝对测量（2S1/2-4P1/2、3/2、2S1/2-6P1/2,3/2、2S1/2-9P1/2、3/2），详细介绍计划对线形状和系统频移的贡献进行理论研究。

项目成果

Precision spectroscopy of 2S–nP transitions in atomic hydrogen for a new determination of the Rydberg constant and the proton charge radius

原子氢中 2SânP 跃迁的精密光谱，用于新测定里德伯常数和质子电荷半径

• DOI: 10.1088/0031-8949/2015/t165/014030
• 发表时间: 2015
• 期刊: Physica Scripta
• 影响因子: 2.9
• 作者: Axel Beyer;Lothar Maisenbacher;Ksenia Khabarova;Arthur Matveev;Randolf Pohl;Thomas Udem;Theodor W Haensch;Nikolai Kolachevsky
• 通讯作者: Nikolai Kolachevsky