铕原子4f76p3/2nd自电离态的光谱

利用三步三色孤立实激发技术(ICE),系统地研究了铕原子4f76p3/2 nd自电离态的光谱,同时首次研究了激光偏振对复杂原子的光谱的影响.为了研究铕原子4f76p3/2 nd自电离态的光谱,首先设计并采用了不同的激发路径,分别将原子布居到同一高激发能域并探测它们在该能域的自电离光谱.通过比较这些光谱的异同并结合上述激发路径所对应的跃迁选择定则,便可唯一地确定这些高激发态的总角动量.为了研究激光偏振对铕原子的影响,设计并使用了两种偏振组合:三步激光都是垂直(πππ),三步激光都是平行(σσσ)(激光偏振方向相对于探测器垂直或平行).为了得到有偏振影响的光谱,分别使3部激光器处于同一偏振,依次对铕原子进行激发,激发路径与终态同上.通过对同一路径不同偏振下的光谱的比较,发现仅能确定极少数的高激发态的总角动量,同时在光谱中一些峰独立于另一偏振光谱存在.

Spectra of Eu 4 f76 p3/2 nd Autoionizing States

Experimental spectra of the Eu 4f76p3/2nd(n=6, 7) autoionizing states were investigated by using the three-step isolated-core excitation technique, while the impact of laser polarization on the spectra was studied for the first time. A detailed interpretation to the complex spectra of the 4f76p3/2nd (n=6, 7) autoionizing states is fulfilled by reproducing their line shapes with a multi-peaked fitting process. The spectroscopic information of the autoionizing states, like the total angular momentum (J), is deduced by comparing their corresponding spectra obtained under different excitation paths.