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In an electronic spectrum the energy levels of atoms arise mainly from electronic configurations characterized by the principal, orbital and spin quantum numbers. Spin splitting refers to the separation of spectral lines due to spin–orbit interaction, which arises from the coupling between the electron’s orbital angular momentum and its spin angular momentum. In principle, this interaction should split a given electronic energy level into closely _______ ____ _______ ____ _____ ________ _____ _______ ____.
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