English: Jablonski diagram of absorbance, non-radiative decay, and fluorescence.
Electronic transitions are about 1 eV. Vibrational transitions are about 0.1 eV. Rotational transitions (not shown) are about 0.001 eV. Absorption is about 1 femtosecond, relaxation takes about 1 picosecond, fluorescence takes about 1 nanosecond.
S0 and S1 represent different electronic states. The other numbers (here 0–3 are shown) represent vibrational states.
Русский: Диаграмма Яблонского для флуоресценции, поглощения и безизлучательных переходов.