Formation and Decay of Excited States

Fig. 5.6 A schematic representation of alternative pathways for formation and decay of excited states. Singlet states are labeled S and triplet states T superscripts 0, 1, 2,. .n,. .. denote the ground state and excited states of increasing energy. Radiative processes (absorption, fluorescence, phosphorescence) are indicated with solid arrows nonradiative processes (intersystem crossing, internal conversion, etc.), with wavy arrows. Internal conversion and intersystem crossing usually proceed via excited vibrational levels of the product state. Diagrams of this type were introduced by A. Jablonski in 1935 in a paper on the mechanism of phosphorescence [295]. The horizontal axis has no physical significance...

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