Abstract

We describe frequency-domain measurements of the time-dependent intensity decays of p-bis[2-(5-phenyloxazolyl)] benzene (POPOP) when collisionally quenched by carbon tetrabromide (CBr 4). The frequency-domain data reveal the existence of a quenching rate constant which depends exponentially on the fluorophore—quencher separation. A distance-dependent quenching rate explains the decadesold observation of upward curvature in Stern—Volmer plots

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