Picosecond Kinetics and Reverse Saturable Absorption of Meso-Substituted Tetrabenzoporphyrins
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The mechanism of reverse saturable absorption of meso-substituted tetrabenzoporphyrins was studied by means of picosecond transient spectroscopy. Characteristic 1(π,π*), 3(π,π*), and (d,d) transitions have been observed. The kinetics of the excited states vary with metal substitution. The nonlinear transmission of benzoporphyrins was measured, and the excited-state absorption was determined to be the dominant optical limiting mechanism. The results agreed very well with a five-level model. © 1996 American Chemical Society.
author list (cited authors)
Chen, P., Tomov, I. V., Dvornikov, A. S., Nakashima, M., Roach, J. F., Alabran, D. M., & Rentzepis, P. M.