We report the discovery of seven even-parity energy levels of the Lanthanum atom. These levels are derived from experimental results which are quite difficult to interpret, since most of the investigated structures appear in complicated blend situations. 17 spectral lines can be classified as transitions in which these levels are involved.

Further we could improve the J-values and hyperfine structure constants A of two earlier published levels due to the investigation of additional lines.

中文翻译：

---

从难以解释的测量中得出的中性镧原子的新偶校验能级

我们报告发现镧原子的七个偶数能级。这些水平来自于很难解释的实验结果，因为大多数研究的结构出现在复杂的混合情况下。17 条谱线可以归类为涉及这些级别的跃迁。

此外，由于对附加线的研究，我们可以改进两个较早发表的水平的J 值和超精细结构常数A。