标题： 高精度测量氦-like和铍-like氩离子中$n=2\to n=1$跃迁能量和能级宽度 显示英文标题

标题： High-precision measurements of $n=2\to n=1$ transition energies and level widths in He- and Be-like Argon Ions

摘要： 我们对类氦氩的$1s 2p\,^1P\_1\to 1s^2 \,^1S\_0$线的跃迁能量进行了无参考测量，以及对类铍氩离子的$1s 2s^2 2p\,^1P\_1\to 1s^2 2s^2\,^1S\_0$线的跃迁能量进行了无参考测量。高电荷离子是在电子回旋共振离子源的等离子体中产生的。两种能量测量均使用双平面晶体光谱仪，准确度优于$10^6$的 3 个部分，且不依赖任何理论或实验能量。$1s 2s^2 2p\,^1P\_1\to 1s^2 2s^2\,^1S\_0$跃迁测量是对此核心激发跃迁的首次无参考测量。$1s 2p\,^1P\_1\to 1s^2 \,^1S\_0$跃迁测量确认了海德堡电子束离子阱（EBIT）最近进行的测量。类氦跃迁中的宽度测量是对纯辐射衰变计算的检验。在类铍氩跃迁的情况下，宽度来源于一个辐射通道和三个主要俄歇通道的总和。我们还进行了多组态狄拉克-福克（MCDF）计算，得到了跃迁能量和速率，并与理论和其他实验数据进行了广泛比较。对于此处报告的两种测量，我们发现与最新的理论计算在理论和实验不确定性的综合范围内一致。 显示英文摘要

摘要： We performed a reference-free measurement of the transition energies of the $1s 2p\,^1P\_1\to 1s^2 \,^1S\_0$ line in He-like argon, and of the $1s 2s^2 2p\,^1P\_1\to 1s^2 2s^2\,^1S\_0$ line in Be-like argon ions. The highly-charged ions were produced in the plasma of an Electron-Cyclotron Resonance Ion Source. Both energy measurements were performed with an accuracy better than 3 parts in $10^6$, using a double flat-crystal spectrometer, without reference to any theoretical or experimental energy. The $1s 2s^2 2p\,^1P\_1\to 1s^2 2s^2\,^1S\_0$ transition measurement is the first reference-free measurement for this core-excited transition. The $1s 2p\,^1P\_1\to 1s^2 \,^1S\_0$ transition measurement confirms recent measurement performed at the Heidelberg Electron-Beam Ion Trap (EBIT). The width measurement in the He-like transition provides test of a purely radiative decay calculations. In the case of the Be-like argon transition, the width results from the sum of a radiative channel and three main Auger channels. We also performed Multiconfiguration Dirac-Fock (MCDF) calculations of transition energies and rates and have done an extensive comparison with theory and other experimental data. For both measurements reported here, we find agreement with the most recent theoretical calculations within the combined theoretical and experimental uncertainties.