Kramida Alexander
National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Atoms. 2022 Apr 22;10(2). doi: 10.3390/atoms10020042.
The present article describes a complete reanalysis of all published data on observed spectral lines and energy levels of the first three spectra of actinium (Ac I-III). In Ac I, three previously determined energy levels have been rejected, 12 new energy levels have been found; for six previously known levels, either the values or the energies have been revised, and the ionization energy has been redetermined with an improved accuracy. In the line list of Ac I, three previous classifications have been discarded, 16 new ones have been found, and three have been revised. In Ac II, 16 new energy levels have been established, and 36 new identifications have been found for previously observed but unclassified lines. In both Ac I and Ac II, new sets of transition probabilities have been calculated. For all three spectra, complete datasets of critically evaluated energy levels, observed lines, and transition probabilities have been constructed to serve as recommended data on these spectra.
本文描述了对所有已发表的关于锕（Ac I - III）前三光谱的观测谱线和能级数据的全面重新分析。在Ac I中，三个先前确定的能级已被舍弃，发现了12个新的能级；对于六个先前已知的能级，其 值或能量已被修正，并且电离能已以更高的精度重新确定。在Ac I的谱线列表中，三个先前的分类已被摒弃，发现了16个新的分类，并且三个已被修正。在Ac II中，建立了16个新的能级，并且为先前观测但未分类的谱线发现了36个新的识别。在Ac I和Ac II中，都计算了新的跃迁概率集。对于所有三个光谱，已构建了经过严格评估的能级、观测谱线和跃迁概率的完整数据集，以作为关于这些光谱的推荐数据。
