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FLUORESCENCE LIFETIME AND QUANTUM YIELD OF PHENYLALANINE AQUEOUS SOLUTIONS. TEMPERATURE AND CONCENTRATION EFFECTS
Author(s) -
LEROY E.,
LAMI H.,
LAUSTRIAT G.
Publication year - 1971
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.1751-1097.1971.tb06132.x
Subject(s) - intersystem crossing , quantum yield , excited state , fluorescence , chemistry , aqueous solution , photochemistry , phenylalanine , yield (engineering) , internal conversion , singlet state , dimer , reaction rate constant , radiative transfer , atmospheric temperature range , analytical chemistry (journal) , atomic physics , kinetics , thermodynamics , electron , physics , optics , chromatography , organic chemistry , biochemistry , amino acid , quantum mechanics
— –The influence of concentration and temperature on the fluorescence quantum yield and lifetime (measured by a monophoton technique) of phenylalanine is studied in neutral aqueous solutions (8 × 10 ‐4 ‐10 ‐1 M ) over the temperature range 0–70°C. The rate constants for emission, internal conversion and intersystem crossing are evaluated and show that both non radiative processes contribute efficiently to the deactivation of the singlet state. Evidence for excited dimer formation at high concentration is presented. The binding energy of excimers was found to be 0.19 e V.