Radiative properties of organic molecules in strong photon fields

We have experimentally investigated the dependence of the luminescence intensity of ethanol solutions of 2-(4-pyridyl)-5-phenyloxazole on the intensity of the exciting radiation from an XeCl laser (λ_ex = 308 nm, τ_p = 10 nsec, E_ex=10²²–10²⁶ photons/cm²·sec). We discuss the measurement technique and possible reasons for the change in radiative properties of the investigated solutions under the given conditions. V. D. Kuznetsov Siberian Physicotechnical Institute at Tomsk State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 69–74, April, 1997.