§10.6 Photochemistry 6.2 Physical processes of Excitation and decay (2) Decay of photoexcited molecules Radiation transition Fluorescence and phosphorescence non-reactive decay Radiationless Vibrational cascade and thermal transition energy decay Reaction of excited molecule A"→P reactive deca Energy transfer A+Q→>Q→P(2) Decay of photoexcited molecules decay non-reactive decay reactive decay Radiation transition Radiationless transition Fluorescence and phosphorescence Vibrational cascade and thermal energy Reaction of excited molecule A* → P Energy transfer: A* + Q → Q* → P 6.2 Physical processes of Excitation and decay §10. 6 Photochemistry