1 April 1992 Photophysics of rigidized 7-aminocoumarin laser dyes
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An unusual slow rise of fluorescence intensity from Coumarins 102, 314, and 334, observed under conditions of high intensity laser excitation prompted further investigation of their photophysics by photoquenching, time-resolved transient absorption spectroscopy and time- resolved amplified stimulated emission. The slow rise was found to be the consequence of multi-photon excitation. Principal fate of coumarin molecules so excited was shown to be intersystem crossing to the nonemissive triplet manifold. Rate of intersystem crossing was estimated as ca. 1010 s-1; energy matching between a higher excited singlet state, Sn, and a higher triplet, Tn, is implicated.
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Melville R. V. Sahyun, Melville R. V. Sahyun, D. K. Sharma, D. K. Sharma, } "Photophysics of rigidized 7-aminocoumarin laser dyes", Proc. SPIE 1638, Optical Methods for Time- and State-Resolved Chemistry, (1 April 1992); doi: 10.1117/12.58169; https://doi.org/10.1117/12.58169

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