中文摘要：

采用光电离探测和自电离探测这两种不同的探测方法对铕原子的高激发态光谱进行了详细研究.一方面,采用光电离探测技术,系统测量了在第一电离限之下处于43927—45010cm^-1能域内的奇宇称能级的光谱.通过光谱定标和误差估算等分析手段,获得了32个共振跃迁峰的位置和强度等光谱信息.并根据所用的激发路线和相关的选择定则等原理,进而确定了这些能级的总角动量.通过与相关文献资料的对比和分析,研究发现了12个新能级.另一方面,精心设计了一种能够有效识别不同类型高激发态的鉴别方法.对同一能域中的待测能级,分别采用光电离与自电离技术对其进行探测.通过对比和分析上述两种测量结果,便可将处于这一能域中的Eu原子的Rydberg态与价态区分开来.研究结果表明,在所探测到的32个能级中只有14个能级为Rydberg态,其余均为由内壳层电子的跃迁所构成的原子价态.并利用光谱的量子理论详细讨论并确定了上述Rydberg态的有效量子数.

英文摘要：

In this paper, two different detection methods, photoionization and autoionization, are combined to study the spectrum of highly excited states of Eu atom. On the one hand, the bound Eu spectrum with odd-parity in the region of 43927-45010 cm^-1 has been measured. The spectral information, such as position and intensity, of 32 transitions can be deduced from the spectra with calibration and the error estimation. The information of excitation process and the selection rules enables us to determine their total angular momenta. Comparison with the related literature show that 12 of the states are newly discovered. On the other hand, we design an effective method to identify different types of highly excited states. The spectra of odd-parity states in the same region are measured by both photoionization and autoionization methods, from which we may separate the Rydberg states from the valence states, of the 32 transitions only 14 can be identified as Rydberg states, and the others are valence states. Furthermore, the effective quantum numbers of the Rydberg states are also discussed in detail with the quantum theory.