EIT-ATS 结构分析：图 2 能级结构与跃迁路径的影响

The energy level diagram is shown in Figure 2. The selected energy levels consist of two groups. The first group includes transitions from 5S1/2 to 5P3/2 to 78S1/2 to 79P3/2, and their fine energy structure is shown in Figure 2 (a) and (b) with polarization angles of 'theta=0°' and 'theta=90°', respectively. The second group includes transitions from 5S1/2 to 5P3/2 to 76D5/2 to 79P3/2, and their fine energy structure is shown in Figure 2 (a') and (b') with polarization angles of 'theta=0°' and 'theta=90°', respectively. In Figures 2 (a) and (a'), there are two transition paths that couple four energy levels each, forming an EIT-ATS structure. In Figure 2 (b), there are four transition paths that couple four energy levels each, also forming an EIT-ATS structure. However, in Figure 2 (b'), there are eight transition paths and most of them couple four energy levels each, except for the two outermost paths (named [insert path names here]), which only couple three energy levels and can only form an EIT structure, not an EIT-ATS structure. This will have an important impact on the measurement results.