Precision Studies of Singly and Highly-Charged Ions: Mass Spectrometry and Laser Spectroscopy

该项目使用精密潘宁阱质谱仪，以接近或低于10的1/11的精度进行原子质量测量。重点将是一个精确的氚/氦的相互比较的重要性，确定中微子质量。测量将利用新的，最近证明的技术，同时在潘宁阱中的两个离子的回旋频率测量。这种方法极大地抑制了磁场和陷阱电压波动的影响，这限制了所有以前的工作的精度。现有的类氢和类氦离子精密激光光谱学计划也将继续进行。这些测量测试了相对论QED原子理论，特别是高阶束缚修正。更广泛的影响涉及研究生和本科生的教育以及招募代表性不足的群体的努力。

This project uses a precision Penning trap mass spectrometer to make atomic mass measurements at a precision near or below one part in 10 to the eleventh. Emphasis will be given to a precise intercomparison of tritium/helium with importance to determination of the neutrino mass. The measurements will exploit the novel, recently demonstrated technique of simultaneous cyclotron frequency measurement of two ions in a Penning trap. This method greatly suppresses the effects of fluctuations in the magnetic field and trap voltages which limited the precision of all previous work. The existing program of precision laser spectroscopy of hydrogen-like and helium-like ions will also be continued. These measurements test relativistic QED atomic theory, particularly of higher-order binding corrections. The broader impact involves education of both graduate and undergraduate students as well as efforts to recruit under-represented groups.