What is L-S coupling? Explain
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The energy levels which are characterised by certain values of L and S are called terms and the coupling of angular momenta of individual electrons to a resulting orbital angular momentum and spin is referred to as LS-coupling or Russell-Saunders coupling.
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LS-coupling
When there are unfilled shells in an atom, there may be possibilities to form wavefunctions that correspond to different electronic states for a given configuration. To get a good understanding of the electronic structure, we must be able to define these states and determine how they are energetically ordered.
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