= LS coupling
{c}
{title2=$\mathbf J=\mathbf L+\mathbf S$}
An atomic <addition of angular momentum> scheme in which the individual <orbital angular momentum> vectors first combine into $\mathbf L$ and the individual <spins> into $\mathbf S$, then these combine into total <angular momentum> $\mathbf J$. When <spin-orbit coupling> is weak compared with the interactions between <Electrons> described by <electrostatics>, $L$ and $S$ remain useful approximate <quantum numbers>. The <Landé g-factor> describes the resulting weak-field magnetic splitting.
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