Element

n s

n p

$J\to J^{\prime }$

Wavelength Å

$g{f}_{12}$

S₁₂ (au)

Li

4s

5p

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

24,978.1

3.1 ×10⁻⁴

0.052

Na

6s

5p

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

16,373.8

1.6 ×10⁻¹

2.54

Mg

5s

6p

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

121,464

4.8 ×10⁻²

3.39