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arXiv 1802.05970physics.atom-ph
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类氦和类铍氩离子$n=2\to n=1$跃迁能量和能级宽度的高精度测量

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

J. Machado, C. I. Szabo, J. P. Santos, P. Amaro, M. Guerra, A. Gumberidze, Guojie Bian, J. M. Isac, P. Indelicato, C. Szabó

摘要:

我们进行了无参考的测量的$1s 2p\,^1P\_1\to 1s^2 \,^1S\_0$线在类氦氩,和$1s 2s^2 2p\,^1P\_1\to 1s^2 2s^2\,^1S\_0$线在类铍氩离子的跃迁能量。利用电子回旋共振离子源在等离子体中产生高电荷态离子。两种能量测量都是使用双平晶光谱仪进行的,精确度优于$10^6$中的3个部分,而不参考任何理论或实验能量。$1s 2s^2 2p\,^1P\_1\to 1s^2 2s^2\,^1S\_0$跃迁测量是该核心激发跃迁的第一个无参考测量。$1s 2p\,^1P\_1\to 1s^2 \,^1S\_0$跃迁测量证实了最近在海德堡电子束离子阱(EBIT)进行的测量。类氦跃迁的宽度测量为纯辐射衰变计算提供了检验。在Be类氩跃迁的情况下,宽度的结果从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Dirac-Fock(MCDF)计算的跃迁能量和速率,并做了广泛的比较与理论和其他实验数据。对于这两个测量报告在这里,我们发现与最近的理论计算相结合的理论和实验的不确定性。

英文摘要:

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.

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