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.
Relativistic correlation correction to the binding energies of the ground configuration of Beryllium-like, Neon-like, Magnesium-like and Argon-like ions
我们提出了一个理论研究的双电子复合(DR)的Ar类离子,揭示了新的光的速率系数的行为在低温下,这些离子形成的光电离等离子体。我们提供的总的和部分麦克斯韦平均DR率系数从K II -锌XIII离子的初始基态的结果。预计这些新的结果将提高类Ar M壳层离子电离平衡的准确性,并为天体物理相关X射线吸收特征的详细建模铺平道路。我们利用AUTOSTRUCTURE计算程序获得了目标离子的准确的核心激发阈值,并在独立过程、孤立共振、扭曲波(IPIRDW)近似下对DR截面进行了多组态Breit-Pauli(MCBP)计算。我们的研究结果调解完全没有直接DR计算某些类Ar离子和现有的经验速率公式的可靠性,往往推断出在此等电子序列的重整化数据的问题。
Possible evidence for the production of Ar$_2^{*-}$ metastable negative molecular ions in gaseous argon of two-phase detectors for dark matter searches
Nonrelativistic energies and predissociation widths of quasibound states in the Li$dμ$ molecular ions
对μ子分子离子$^6$ Li $^{3+}dμ$和$^7$ Li $^{3+}dμ$进行了数值研究。使用复坐标旋转方法,我们发现了六个旋转状态(每个同位素三个),这是共振态的寿命为皮秒的顺序。这些分子系统可能对研究低能聚变反应有意义。计算了两种同位素的$S$态的关键量$|Ψ(0)|^2$,即核合并点处波函数的平方,计算精度优于3%.
Plasma environment effects on K lines of astrophysical interest. II. Ionization potentials, K thresholds, radiative rates and Auger widths in Ne- through He-like iron ions (Fe xvii - Fe xxv)
目的。在黑洞周围的吸积盘的背景下,我们估计等离子体环境的原子参数的影响与高电荷铁离子,即Fe xvii - Fe xxv的K-空位状态的衰变。方法.在相对论多组态Dirac-Fock(MCDF)框架下,电子-核和电子-电子等离子体屏蔽近似为时间平均Debye-Huckel势。结果本文报道了电子温度和密度分别在1 E5 - 1 E7 K和1 E18 - 1 E22 cm-3范围内的天体物理等离子体的修正电离势、K阈值、波长、辐射发射率和俄歇宽度。结论.我们的结论是,高分辨率的微量热仪机载未来的X射线任务,如XRISM和ATHENA预计将是敏感的铁K边缘的降低,由于极端的等离子体条件下发生在紧凑的物体周围的吸积盘。
X-ray and extreme-ultraviolet spectra from collisions of Ar$^{18+}$ and O$^{8+}$ ions with neutrals
Max-Planck-Institut für Kernphysik(马克斯·普朗克核物理研究所);NASA Goddard Space Flight Center(美国国家航空航天局戈达德太空飞行中心);Johns Hopkins University(约翰斯·霍普金斯大学);Helmholtz-Institut Jena(亥姆霍兹耶拿研究所);GSI Helmholtzzentrum für Schwerionenforschung(GSI重离子研究中心);University of California(加利福尼亚大学);SRON, Space Research Organisation Netherlands(荷兰空间研究组织)
Vibrationally Resolved Decay Width of Interatomic Coulombic Decay in HeNe
我们研究了氦氖从低于He 1s3p激发到He电离阈值的电离。我们观察到氦氖$^+$离子的增强超过60倍时,他侧共振耦合到辐射场。这些离子是Najjari等人[Phys. Rev. Lett. 105,153002(2010)]。此外,我们的数据提供了电子和振动态分辨的衰变宽度的原子间库仑衰变(ICD)的HeNe二聚体。我们发现,ICD的寿命强烈增加,增加振动状态。
Measurement of line widths and permanent electric dipole moment change of the Ce 4f-5d transition in Y_2SiO_5 for a qubit readout scheme in rare-earth ion based quantum computing
Plasma-environment effects on K lines of astrophysical interest III. IPs, K thresholds, radiative rates, and Auger widths in Fe ix - Fe xvi
目的。在黑洞吸积盘的背景下,我们的目标是计算等离子体环境的原子参数的影响,用于模拟衰减的K-空位状态在中等电荷的铁离子,即Fe ix - Fe xvi。方法.我们使用完全相对论多组态Dirac-Fock(MCDF)方法,用时间平均Debye-Huckel势近似等离子体电子-核屏蔽和电子-电子屏蔽。结果我们报告修改后的电离势,K阈值能量,波长,辐射发射率,和俄歇宽度的等离子体特征的电子温度和密度范围内的$10^5$ - $10^7$ K和$10^{18}$ - $10^{22}$ cm $^{-3}$。结论.这项研究证实,未来的XRISM和ATHENA空间飞行任务所载的高分辨率X射线光谱仪将能够探测到由于致密物体周围的吸积盘中出现的极端等离子体条件而导致的这些离子K边缘的降低。