Lifetimes (s) | Energy levels (cm−1) | Configurations | Terms | Percentage Composition |
| 0 | 1s 2 2s | 2 S 1/2 | 100% |
3.812 × 10 −12 | 2,788,650 | 1s 2 3s | 2 S 1/2 | 100% |
5.296 × 10 −13 | 2,870,540 | 1s 2 3d | 2 D 3/2 | 100% |
5.346 × 10 −13 | 2,871,530 | 1s 2 3d | 2 D 5/2 | 100% |
5.693 × 10 −12 | 3,740,040 | 1s 2 4s | 2 S 1/2 | 100% |
1.229 × 10 −12 | 3,773,500 | 1s 2 4d | 2 D 3/2 | 100% |
1.239 × 10 −12 | 3,774,000 | 1s 2 4d | 2 D 5/2 | 100% |
8.880 × 10 −12 | 4,181,300 | 1s 2 5s | 2 S 1/2 | 100% |
3.508 × 10 −12 | 4,192,300 | 1s 2 5d | 2 D 3/2 | 100% |
3.533 × 10 −12 | 4,192,300 | 1s 2 5d | 2 D 5/2 | 100% |
7.800 × 10 −12 | *4,199,270 | 1s 2 5g | 2 G 5/2 | 100% |
7.804 × 10 −12 | *4,199,330 | 1s 2 5g | 2 G 7/2 | 100% |
1.379 × 10 −11 | *4,415,640 | 1s 2 6s | 2 S 1/2 | 100% |
6.412 × 10 −12 | 4,419,350 | 1s 2 6d | 2 D 3/2 | 100% |
6.455 × 10 −12 | 4,419,350 | 1s 2 6d | 2 D 5/2 | 100% |
1.384 × 10 −11 | *4,425,975 | 1s 2 6g | 2 G 5/2 | 100% |
1.384 × 10 −11 | *4,426,010 | 1s 2 6g | 2 G 7/2 | 100% |
2.046 × 10 −11 | *4,556,200 | 1s 2 7s | 2 S 1/2 | 100% |
6.284 × 10 −12 | *4,552,860 | 1s 2 7d | 2 D 3/2 | 100% |
6.319 × 10 −12 | 4,553,085 | 1s 2 7d | 2 D 5/2 | 100% |
2.916 × 10 −11 | *4,647,077 | 1s 2 8s | 2 S 1/2 | 100% |
9.419 × 10 −12 | *4,633,445 | 1s 2 8d | 2 D 5/2 | 100% |
9.369 × 10 −12 | 4,633,565 | 1s 2 8d | 2 D 5/2 | 100% |
4.314 × 10 −13 | *16,971,300 | 1s2s 2 | ( 2 S) 2 S 1/2 | 92% + 8% 1s2p 2 ( 1 S) 2 S |
2.060 × 10 −11 | 17,246,905 | 1s2p 2 | ( 3 P) 4 P 1/2 | 100% |
1.987 × 10 −11 | 17,251,290 | 1s2p 2 | ( 3 P) 4 P 3/2 | 100% |
1.075 × 10 −11 | 17,257,990 | 1s2p 2 | ( 3 P) 4 P 5/2 | 100% |
3.789 × 10 −14 | 17,353,875 | 1s2p 2 | ( 1 D) 2 D 3/2 | 97% |
4.011 × 10 −14 | 17,355,065 | 1s2p 2 | ( 1 D) 2 D 5/2 | 100% |
1.299 × 10 −14 | 17,378,605 | 1s2p 2 | ( 3 P) 2 P 1/2 | 100% |
1.319 × 10 −14 | 17,388,180 | 1s2p 2 | ( 3 P) 2 P 3/2 | 97% |
4.198 × 10 −14 | 17,498,570 | 1s2p 2 | ( 1 S) 2 S 1/2 | 91% + 8% 1s2s 2 ( 2 S) |