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PHOTOPRODUCTION OF IONS FROM CHLOROPHYLL α IN SOLUTION STUDIED BY FLASH PHOTOLYSIS and PHOTOCONDUCTIVITY
Author(s) -
Imura Takeshi,
Furutsuka Takashi,
Kawabe Kazuo
Publication year - 1975
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.1751-1097.1975.tb08824.x
Subject(s) - photochemistry , ionic bonding , chemistry , flash photolysis , photocurrent , triplet state , ion , pigment , photoconductivity , absorption (acoustics) , acetonitrile , absorption spectroscopy , ionization , action spectrum , chlorophyll , materials science , molecule , optoelectronics , organic chemistry , optics , physics , quantum mechanics , reaction rate constant , kinetics , composite material
— Ionic species were detected electrically on flash excitation of chlorophyll α following rapid production of the triplet state of the pigment. The action spectrum of photocurrent agreed well with the absorption bands of the pigment in the visible region; the threshold for the formation of ionic species in acetonitrile was 1.8 eV. Oxygen gas introduced into the solution completely prevented the appearance of the triplet and ionic species. The latter are suggested to result from electron‐transfer between the triplet pigments. Decay processes of the ionic species varied markedly with changes in the solvent polarity. Direct photo‐ionization of the pigment could be observed by UV excitation in some non‐polar solvents.