Spectrum and energy levels of the low-lying configurations of Nd III
Spectrum and energy levels of the low-lying configurations of Nd III
复制标题
Nd III 低位构型的光谱和能级
DOI：
10.1051/0004-6361/202348794
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发表时间：
2024
影响因子：
6.5
通讯作者：
Ding M
中科院分区：
文献类型：
--
作者：
Ding M
目标。我们的目标是通过高分辨率光谱和半经验计算准确确定双电离钕（Nd III）的低位开壳构型4f4、4f35d、4f36s和4f36p的结合到结合跃迁波长和能级。使用潘宁和空心阴极放电灯在 11 500-54000 cm−1(8695–1852 Å) 范围内通过傅里叶变换光谱以高达 106 的分辨率记录了钕 (Nd,Z= 60) 的发射光谱。波数测量精确到几个 10−3cm−1。使用 Nd 真空滑动火花的光栅光谱和恒星光谱来帮助识别谱线和能级。为了进行分析，使用由新建立的能级参数化的 Cowan 代码进行了新的 Nd III 原子结构和跃迁概率计算。结果。根据潘宁灯光谱对 Nd III 的 432 个跃迁进行分类，确定了 Nd III 的 4f4、4f35d、4f36s 和 4f36p 配置的 144 个能级，其中 105 个是首次通过实验建立的。在先前公布的 40 个 Nd III 能级中，修订了 1 个，确认了 39 个。结论。这些结果不仅将为未来的Nd III半经验原子结构计算提供基准和改进，而且使Nd III更可靠的天体物理应用成为可能，例如千新星和化学奇特恒星的丰度分析，以及这些恒星中脉动波传播的研究。
Aims. Our goal is to accurately determine bound-to-bound transition wavelengths and energy levels of the low-lying open-shell configurations 4f4, 4f35d, 4f36s, and 4f36p of doubly ionised neodymium (Nd III) through high-resolution spectroscopy and semi-empirical calculations.Methods. The emission spectra of neodymium (Nd,Z= 60) were recorded using Penning and hollow cathode discharge lamps in the region 11 500-54000 cm−1(8695–1852 Å) by Fourier transform spectroscopy at resolving powers up to 106. Wavenumber measurements were accurate to a few 10−3cm−1. Grating spectroscopy of Nd vacuum sliding sparks and stellar spectra were used to aid line and energy level identification. For the analysis, new Nd III atomic structure and transition probability calculations were carried out using the Cowan code parameterised by newly established levels.Results. The classification of 432 transitions of Nd III from the Penning lamp spectra resulted in the determination of 144 energy levels of the 4f4, 4f35d, 4f36s, and 4f36p configurations of Nd III, 105 of which were experimentally established for the first time. Of the 40 previously published Nd III levels, one was revised and 39 were confirmed.Conclusions. The results will not only benchmark and improve future semi-empirical atomic structure calculations of Nd III, but also enable more reliable astrophysical applications of Nd III, such as abundance analyses of kilonovae and chemically peculiar stars, and studies of pulsational wave propagation in these stars.
GFit，一种用于确定实验光谱中峰位置和强度的计算机程序。
DOI：
--
发表时间：
1998
期刊：
影响因子：
--
作者：
L. Engström
通讯作者：
L. Engström