Element

n s

n p

$J\to J^{\prime }$

Wavelength Å

$g{f}_{12}$

S₁₂ (au)

Cs

6s

6p

$\frac{1}{2}\to \frac{1}{2}$

8521.6

4.00

K

5s

4p

$\frac{1}{2}\to \frac{1}{2}$

12,432

0.18

K

6s

4p

$\frac{1}{2}\to \frac{1}{2}$

6911.0

1.4 ×10⁻²

K

5s

7p

$\frac{1}{2}\to \frac{1}{2}$

9954.1

2.0 ×10⁻³