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)