Picosecond Studies of Temperature and Solvent Effects on the Fluorescence from Coumarin 102 and Acridine
Picosecond kinetics often provides the only way of detecting and unravelling complex molecular interactions in liquids. Here we report about the kinetics of the fluorescence from two molecules using picosecond streak camera techniques. Upon excitation both coumarin 102 and acridine exhibit interesting spectral dynamical behavior depending sensitively on the temperature and solvent. For understanding energy dissipation in polyatomic molecules, the dependence of the relaxation times on emission and excitation wavelengths and upon temperature can be crucial. The behavior of the coumarin 102 emission with temperature and solvent allows us to interpret the results in terms of formation at an excited state [1,2] hydrogen bonded complex between the coumarin 102 and solvent molecules. The dependence of the fluorescence lifetime of acridine with temperature for several solvents demonstrates that an activation energy is present and that current models are inadequate.
KeywordsFormation Time Streak Camera Blue Edge Normal Alcohol Alamos Scientific Laboratory
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