Element

n s

n p

$J\to J^{\prime }$

Wavelength Å

$g{f}_{12}$

S₁₂ (au)

Li

4s

5p

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

24,978.

3.17 ×10⁻⁴

0.05

Na

6s

5p

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

16,373.

1.60 ×10⁻¹

2.54

Mg

5s

6p

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

121,464

4.80 ×10⁻²

3.39