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

该研究计划有两个不同的研究项目：原子和分子离子的精密质量测量和类氢和类氦离子的激光光谱学。第一个项目使用潘宁阱质谱仪测量原子质量，精度优于万亿分之十。 该项目的重点将是测量氚和氦-3之间的质量差，这对中微子质量的测量具有重要意义。 将进行进一步的质量测量，以支持确定精细结构常数的实验和潜在的核物理实验，在这些实验中，需要精确了解衰变中的能量释放。 分子离子的偶极矩和极化率的额外测量将被进行。 第二个项目是类氢氮离子和类氦硅离子精细结构兰姆位移跃迁的精密激光光谱学。 这些实验使用高度稳定的激光和快速离子束。这些测量测试了相对论量子电动力学原子理论，特别是高阶束缚修正。这项工作的更广泛的影响在于这些测量对核和基本粒子物理学以及量子信息科学实验的重要性。 第二个重要的更广泛的影响是对学生的研究培训;该项目积极地让高中生、本科生和研究生参与研究。

This research program has two distinct research project: precision mass measurement of atomic and molecular ions and laser spectroscopy of hydrogen-like and helium-like ions.The first project uses a Penning-trap mass spectrometer to measure atomic masses with fractional precisions better than ten parts per trillion. The major emphasis of this project will be a measurement the mass difference between tritium and helium-3, which has an importance in measurement of the neutrino mass. Further mass measurements will be made in support of experiments to determine the fine-structure constant and potential nuclear physics experiments where precise knowledge of energy release in a decay is necessary. Additional measurements of dipole moments and polarizabilities of molecular ions will be made. The second project is precision laser spectroscopy of the fine-structure-Lamb shift transition in hydrogen-like nitrogen ions and helium-like silicon ions. These experiments use highly stable lasers and fast ion beams. These measurements test relativistic quantum electrodynamics atomic theory, particularly of higher-order binding corrections. The broader impact of this work lies in the importance of these measurements to experiments in nuclear and fundamental particle physics and quantum information science. The second important broader impact is the research training of students; the project actively involves high-school students, undergraduates, and graduate students in the research.