Through combining experimental branching fractions (BFs) with radiative lifetimes, transition probabilities and oscillator strengths of Eu I for 39 lines from 16 excited levels were derived for the first time. The energies range from 27852.90 to 41443.70 cm-1. The BFs were determined in this work using the Fourier transform spectra available from National Solar Observatory database, and the lifetimes were obtained from literature. Furthermore, BFs for 22 lines, previously reported in the literature, were also determined for comparisons. The new results reported in this work will enrich spectral database and are expected to be widely used in many fields.

中文翻译：

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确定 Eu I 中某些水平的转换概率和振荡器强度


通过将实验分支分数 （BFs） 与辐射寿命相结合，首次推导出了 16 个激发能级的 39 条线的 Eu I 的跃迁概率和振荡器强度。能量范围从 27852.90 到 41443.70 cm-1。在这项工作中，使用美国国家太阳天文台数据库提供的傅里叶变换光谱确定了 BFs，并从文献中获得寿命。此外，还确定了先前在文献中报道的 22 系的 BF 以进行比较。这项工作报道的新结果将丰富光谱数据库，并有望在许多领域得到广泛应用。