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Explain what is meant by spectroscopic terms
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Spectroscopic terms refer to a set of quantum numbers that describe the electronic state of an atom or molecule. These terms are derived from the angular momentum of the electrons and the spin of the nucleus. They are essential for understanding the energy levels of atoms and molecules, which are responsible for the absorption and emission of light in spectroscopy. For example, the term symbol for a ground state atom like hydrogen is 1S, where the '1' denotes the principal quantum number, 'S' denotes the total orbital angular momentum, and the superscript '1' denotes the multiplicity (2S+1).
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