采用孤立实激发技术, 对铕原子4f76p3/2ns (n=7, 8)自电离态的光谱进行了系统的研究, 同时是首次在不同激光偏振组合下进行的研究。首先, 用前两束激光分步将铕原子从基态4f76s2 经中间4f76s6p态激发至4f76sns里德堡态, 然后再用第三束激光通过离子实4f76s+→4f76p+3/2的跃迁将其进一步激发至4f76p3/27s自电离态或4f76p3/28s自电离态。对铕原子4f76p3/2ns (n=7, 8)自电离态复杂的光谱分别给出了详细的解释, 从中我们可以获得一些重要的光谱信息, 比如自电峰的能级位置和线宽等, 同时还可以观察到收敛于不同离子限的自电离系列之间的组态相互作用。最后, 通过比较不同激光偏振组合下的自电离光谱, 确定了一些自电离态的总角动量的值。

To study the spectra of Eu 4f76p3/2ns (n=7, 8) autoionizing states, the isolated-core excitation (ICE) technique was utilized, while the impact of laser polarization on the spectra was studied for the first time. The atom was excited from the ground state 4f76s2 via the first excited 4f76s6p states to the 4f76sns Rydberg states by the first two lasers, which were further excited to the 4f76p3/27s or 4f76p3/28s autoionizing states with the 4f76s+→4f76p+3/2 resonance transition by the third laser. The detailed interpretation to the complex spectra of the 4f76p3/2ns (n=7, 8) autoionizing states was given, from which the spectroscopic information, such as the level energy and line width of the autoionization peak, can be obtained. Furthermore, the configuration interaction among different autoionization series converging to different ionization limits was also observed. Finally, the values of the total angular momentum J of some autoionizing states were identified with different laser polarization combinations.