A Grotrian diagram is a visual representation used in spectroscopy and quantum mechanics to illustrate the energy levels of a particular atom or molecule and the transitions between them. It provides a graphical way to depict the electronic states of atoms and the allowed transitions (e.g., radiative transitions) that occur as electrons move between these states. In a Grotrian diagram: - **Energy Levels**: The vertical axis represents energy levels, where higher positions indicate higher energy states.
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