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THE NON‐RADIATIVE DISSIPATION OF EXCITATION ENERGY IN SOLID CINNAMIC ACID BY DIMER FORMATION
Author(s) -
Rennert J.,
Ruggiero E. M.,
Rapp J.
Publication year - 1967
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1967.tb08787.x
Subject(s) - cinnamic acid , excited state , quantum yield , dimer , chemistry , excitation , photochemistry , dissipation , yield (engineering) , photon , radiant energy , intensity (physics) , atomic physics , radiation , materials science , physics , optics , organic chemistry , thermodynamics , quantum mechanics , metallurgy , fluorescence
— The quantum efficiency for the photodimerization of trans ‐cinnamic acid in the solid state is independent of intensity and is found to have a value approaching two. Thus, the reaction involves one excited and one un‐excited molecule. During the exposure, a dimer film developing on the surface of the cinnamic acid layer attenuates the intensity of the radiation incident on the unreacted cinnamic acid. This gives the appearance of a decrease in the quantum yield with increasing number of photons incident.