Ba原子6pnd(J=1,3)自电离光谱的实验研究

Study of Ba 6pnd(J=1,3) autoionizing states

采用三台可调谐激光实施孤立实激发,分三步将处于基态的Ba原子激发到6p1/2nd(J=1,3)和6p3/2nd(J=1,3)自电离态上,获得了分别从6snd1D2(n=7—15)和6snd3D2(n=7—12)激发而得到的6p1/2nd(J=1,3)和6p3/2nd(J=1,3)自电离光谱,重点对主量子数n较低的自电离态进行了实验研究.通过光谱的线形拟合得到了上述能级的位置和宽度等数据,进而获得了量子亏损和约化宽度等信息.通过对不同系列的自电离光谱的分析和比较,详细讨论了这些自电离态的光谱特征及其复杂光谱结构的成因.

Ba 6p3n nd （ J = 1,3） autoionizing states, especially those with lower principal quantum numbers, have been experimentally studied using the isolated core excitation scheme with three dye lasers. Level energies and widths of 6p1/2 nd and 6P3/2 nd （J = 1,3）autoionizing states, which are excited from 6snd ^1D2 Rydberg states with n = 7--15 and 6snd 3D2 Rydberg states with n = 7--12, are reported. Examination of autoionizing states with lower principal quantum number （ n = 7-9） exhibited the admixture between states converging to 6p3/2 and 6p1/2 ionization threshold. Moreover, some discussion is made based on comparison between different autoionizing series, so that one may explain the complex spectral structures of these states.