qspec.lande_j  (  s ,  l ,  j ,  approx_g_s = False  )[source]

The electronic g-factor in the LS-coupling scheme $$ g_J = -\frac{J(J + 1) + L(L + 1) - S(S + 1)}{2J(J + 1)} + g_s\,\frac{J(J + 1) - L(L + 1) + S(S + 1)}{2J(J + 1)}. $$ Note that in this definition the negative charge of the electron is included in the g-factor, such that $g_s$ is negative.

Parameters:

squant_like

The electron spin quantum number $S$.

lquant_like

The electronic angular momentum quantum number $L$.

jquant_like

The electronic total angular momentum quantum number $J$.

approx_g_sbool

Whether to use g_s = -2 (True) or the QED result g_s = -2.0023... (False). The default is False.

Returns:

outfloat

The electronic g-factor $g_J$.