https://mazziotti.uchicago.edu/qcdictionary/o_terms/oscillator_strength/index.html Two major pieces of information are obtained from a spectral plot of an atom or a molecule. First, the energy of the transition, and second the intensity of the transition. The intensity of the transition suggests how likely the transition is (a.k.a how strongly coupled the two states are). Quantum mechanically, the likelihood of the transition… Hugo en-us