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1. What is the difference between LS coupling and JJ coupling?

2. What is the relation between the quantum states allowed by the LS coupling exclusion principle for a subshell with one hole (i.e., completely filled except for one electron) and the quantum states allowed for a subshell with one electron? Would there be a simple relation between the optical excitations of a halogen atom and the optical excitations of an alkali atom?

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