Photochemistry: Quantum Yield and the Jablonski Diagram
Physical Chemistry · Photochemistry Photochemistry: Quantum Yield and the Jablonski Diagram Absorbing a photon puts a molecule somewhere unusual. The Jablonski diagram maps every route back down, and quantum yield counts which route was taken. BSc & MSc · Physical Chemistry · Concept The short answer: Quantum yield is the number of molecules undergoing a process per photon absorbed. The Jablonski diagram organises the competing routes back to the ground state — fluorescence, internal conversion, intersystem crossing and phosphorescence — and their relative rates decide what is observed. The two basic laws Grotthuss–Draper law: only light that is absorbed can…