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中文摘要：
利用三步激光共振激发结合场电离探测技术,系统地研究了铕原子归属于第一电离限4f76s 9S4的4f76snp Rydberg态的场电离过程,得到了铕原子4f76snp Rydberg态的场电离光谱图。在光激发之后施加脉宽为0.2μs的脉冲电场,连续扫描电压得到场电离过程图。从4f76snp Rydberg态的场电离过程图谱中,可以精确地获得态的场电离阈,观察电场逐步从0到3kV变化时原子的演化过程。特别是,受黑体辐射的影响,一些结构出现在了场电离光谱图上。
英文摘要：
The field ionization process of Eu 4f76snp Rydberg states converging to the first ionization limit 4f76s 9 S4 was systematically investigated. Firstly, the spectra of Rydberg states 4f76snp of Eu atom were measured using the three-step laser excitation and electric field ionization ( EFI) method. Secondly, the EFI pulse(pulse width of 0. 2μs)was applied after laser excitation. Then, we contin-uously scan field ionization voltage to observe the EFI process, and to realize the potential of field ionization we need to understand what happens to the atoms as the pulse field rises from 0 to 3 kV. The exact location of ionization threshold can be obtained when the peak of ionization field changes. Especially, above the threshold, some structures are found due to black body radiation ( BBR) .
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Investigation of odd-parity excited states of europium atoms by resonant photoionization spectroscop
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