Abstract
Under high-intensity nanosecond 1064 nm irradiation of a collagen-rhodamine 6G (R6G) system, multiquantum excitation of the R6G molecules to their S2 state was facilitated. The observation of this effect was achieved through associated energy transfer to the resonant collagen excited state band. Analogous cascaded energy transfer phenomena, resulting from the S2 electronic state of R6G, were observed in an R6G-collagen-coumarin system.
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