§10.6 Photochemistry 6.2 Physical processes of Excitation and decay (1)Photoexcitation Transition Time Scale Radiative Process? Internal Conversion 10 -14 10 no 14 Vibrational relaxation 10 -10s no 15 Absorption 10s yes Phosphorescence 10-10s yes Intersystem Crossing 10°10s no Fluorescence 10-10s yes https://chem.libretexts.org/textbook_maps/physical_andtheoreticAlChemistryTextbook_maps/suppl emental_ Modules_(Physical and_ Theoretical_ Chemistry)/Spectroscopy/Electronic_ Spectroscopy/Jablo ski diagramTransition Time Scale Radiative Process? Internal Conversion 10-14 - 10-11 s no Vibrational Relaxation 10-14 - 10-11 s no Absorption 10-15 s yes Phosphorescence 10-4 - 10-1 s yes Intersystem Crossing 10-8 - 10-3 s no Fluorescence 10-9 - 10-7 s yes 6.2 Physical processes of Excitation and decay (1) Photoexcitation: §10. 6 Photochemistry https://chem.libretexts.org/Textbook_Maps/Physical_and_Theoretical_Chemistry_Textbook_Maps/Suppl emental_Modules_(Physical_and_Theoretical_Chemistry)/Spectroscopy/Electronic_Spectroscopy/Jablo nski_diagram