Explain the origin of fluorescence and phosphorescence spectra in terms of Jablonski diagram.

Fluorescence and phosphorescence spectra are phenomena observed in spectroscopy and can be explained using the Jablonski diagram, a graphical representation of the electronic energy levels in a molecule. The Jablonski diagram consists of three main energy levels: the ground state (S0), excited singlet states (S1, S2, etc.), and excited triplet states (T1, T2, etc.).

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