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- https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Physical_Chemistry_(LibreTexts)/15%3A_Lasers_Laser_Spectroscopy_and_Photochemistry/15.01%3A_Electronically_Excited_Molecules_can_Relax_by_a_Number_of_ProcessesThis page covers the mechanisms of laser operation, emphasizing molecular transitions between excited and ground states, influenced by fluorescence and phosphorescence. It explains the differences in ...This page covers the mechanisms of laser operation, emphasizing molecular transitions between excited and ground states, influenced by fluorescence and phosphorescence. It explains the differences in lifetime and energetics between these processes, including vibrational relaxation, internal conversion, and intersystem crossing.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/10%3A_Spectroscopic_Methods/10.06%3A_Photoluminescent_SpectroscopyThis page provides an in-depth explanation of photoluminescence, dividing it into two categories: fluorescence and phosphorescence. It describes the processes, mechanisms, and factors influencing both...This page provides an in-depth explanation of photoluminescence, dividing it into two categories: fluorescence and phosphorescence. It describes the processes, mechanisms, and factors influencing both types, including radiative and non-radiative deactivation pathways. The page discusses the technological advancements in fluorescence and phosphorescence spectroscopy, related instrumentation, and depicts their quantitative applications for analyzing inorganic and organic analytes.
- https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Basic_Principles_of_Organic_Chemistry_(Roberts_and_Caserio)/28%3A_Photochemistry/28.02%3A_Light_Absorption_Flourescence_and_PhosphorescenceWhen a molecule absorbs sufficient radiant energy to cause electronic excitation, the spin of the excited electron remains unchanged in the transition. That is to say, ground-state molecules with pair...When a molecule absorbs sufficient radiant energy to cause electronic excitation, the spin of the excited electron remains unchanged in the transition. That is to say, ground-state molecules with paired electrons give excited states with paired electrons, not triplet states. The excited state can return to the ground state with emission of radiation; this is known as fluorescence, the wavelength of fluorescence being different from that of the original light absorbed. Other processes compete.
