High-accuracy Measurements of Core-excited Transitions in Light Li-like Ions

Moto Togawa, Steffen Kühn, Chintan Shah, Vladimir A. Zaystev, Natalia S. Oreshkina, Jens Buck, Sonja Bernitt, René Steinbrügge, Jörn Seltmann, Moritz Hoesch, Christoph H. Keitel, Thomas Pfeifer, Maurice A. Leutenegger, José R. Crespo López-Urrutia
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Abstract

The transition energies of the two $1s$-core-excited soft X-ray lines (dubbed q and r) from $1s^2 2s ^1S_{1/2}$ to the respective upper levels $1s(^{2}S)2s2p(^{3}P) ^{2}P_{3/2}$ and $^{2}P_{1/2}$ of Li-like oxygen, fluorine and neon were measured and calibrated using several nearby transitions of He-like ions. The major remaining source of energy uncertainties in monochromators, the periodic fluctuations produced by imperfect angular encoder calibration, is addressed by a simultaneously running photoelectron spectroscopy measurement. This leads to an improved energy determination of 5 parts per million, showing fair agreement with previous theories as well as with our own, involving a complete treatment of the autoionizing states studied here. Our experimental results translate to an uncertainty of only 1.6\,km/s for the oxygen line qr-blend used to determine the outflow velocities of active galactic nuclei, ten times smaller than previously possible.
高精度测量轻锂离子的核激发跃迁
测量了从 1s^2 2s ^1S_{1/2}$到类似锂的氧、氟和氖的各自高层$1s(^{2}S)2s2p(^{3}P) ^{2}P_{3/2}$和$^{2}P_{1/2}$的两条 $1s$ 核心激发的软 X 射线(分别称为 q 和 r)的转换能量,并利用附近的几个类似氦的离子的转换进行了校准。同时进行的光电子能谱测量解决了单色仪能量不确定性的主要剩余来源,即不完善的角度编码校准所产生的周期性波动。这使得能量测定结果提高了百万分之五,显示出与以前的理论以及我们自己的理论相当一致,包括对这里研究的自电离状态的完整处理。我们的实验结果使用于确定活动星系核外流速度的氧线qr-混合物的不确定性仅为1.6/千米/秒,比以前小十倍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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