Abstract
Fluorescence quenching of some polycyclic hydrocarbons in different solvents has been studied as a function of excitation wavelength. With most quenchers the Stern-Volmer quenching constant remains insensitive to the wavelength of the irradiating beam. But when CCl 4 and CHCl 3 are used as quenchers, the quencing constant obtained by populating the second excited state of the hydrocarbon is larger than the corresponding value for the first excited state. However, excitation into the different vibrational sublevels of a particular electronic state does not affect the quenching constant. Quenching of the second excited state is ascribed to the formation of a solvated ion-pair.
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