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Explain spectroscopic terms
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Spectroscopic terms refer to the electronic states of atoms or molecules. They are characterized by quantum numbers like spin multiplicity (S), total angular momentum (J), and orbital angular momentum (L). These terms arise from the coupling of electron spin and orbital angular momenta, leading to different energy levels within an atom or molecule. For example, a singlet state (S=0) indicates all electron spins are paired, while a triplet state (S=1) indicates two unpaired spins. Spectroscopic terms are essential in understanding the electronic structure and transitions involved in spectroscopy.
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