Dynamics of an unbalanced two-ion crystal in a Penning trap for application in optical mass spectrometry

The Ramsey method in high-precision mass spectrometry with Penning traps: Experimental results

The highest precision in direct mass measurements is obtained with Penning trap mass spectrometry. Most experiments use the interconversion of the magnetron and cyclotron motional modes of the stored ion due to excitation by external radiofrequency-quadrupole fields. In this work a new excitation scheme, Ramsey's method of time-separated oscillatory fields, has been successfully tested. It has been shown to reduce significantly the uncertainty in the determination of the cyclotron frequency and thus of the ion mass of interest. The theoretical description of the ion motion excited with Ramsey'…

通过Penning阱光谱学观测极长寿命亚稳电子态衰变的实验途径

Experimental Access to Observing Decay from Extremely Long-Lived Metastable Electronic States via Penning Trap Spectrometry

本研究提出一种基于Penning阱单离子质谱的顺序脉冲与相位测量方案，用于直接观测高电荷离子中亚稳电子态的衰变过程，以测量超过秒级的超长寿命，并通过MCDHF理论计算验证了其可行性。

Electric and magnetic field optimization procedure for Penning trap mass spectrometers

Significant systematic errors in high-precision Penning trap mass spectrometry can result from electric and magnetic field imperfections. An experimental procedure to minimize these uncertainties is presented for the on-line Penning trap mass spectrometer ISOLTRAP, located at ISOLDE/CERN. The deviations from the ideal magnetic and electric fields are probed by measuring the cyclotron frequency and the reduced cyclotron frequency, respectively, of stored ions as a function of the time between the ejection of ions from the preparation trap and their capture in the precision trap, which influence…

Detection of metastable electronic states by Penning trap mass spectrometry

State-of-the-art optical clocks achieve fractional precisions of $10^{-18}$ and below using ensembles of atoms in optical lattices or individual ions in radio-frequency traps. Promising candidates for novel clocks are highly charged ions (HCIs) and nuclear transitions, which are largely insensitive to external perturbations and reach wavelengths beyond the optical range, now becoming accessible to frequency combs. However, insufficiently accurate atomic structure calculations still hinder the identification of suitable transitions in HCIs. Here, we report on the discovery of a long-lived metas…

通过彭宁阱质谱法观测高电荷铅离子中的低激发亚稳态电子态

Observation of a low-lying metastable electronic state in highly charged lead by Penning-trap mass spectrometry

本文通过Pentatrap质谱仪直接测定类铌Pb$^{41+}$中亚稳态激发能为31.2(8) eV，并结合理论计算验证其可作为高电荷离子光钟候选态，具有极低频率不稳定度。

捕获高电荷离子的光谱学：在反质子湮灭后产生的离子

Spectrometry of Captured Highly Charged Ions Produced Following Antiproton Annihilations

本研究通过多步骤嵌套陷阱技术实现了反质子湮灭后高电荷离子的捕获与光谱分析，为研究低温核湮灭碎片和探测核外周提供了基础。