Excited-state absorption in oxidized cytochrome c solution |
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Authors: | NM?Barbosa Neto AA?Andrade L?De Boni L?Misoguti Email author" target="_blank">SC?ZílioEmail author CR?Mendon?a |
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Institution: | (1) Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970 São Carlos, SP, Brazil |
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Abstract: | Nonlinear absorption dynamics of oxidized cytochrome c in water solution was investigated at 532 nm with Z-scan and pump–probe techniques. The optical characterization of this compound is very important owing to its similarity with hematoporphyrin-based drugs commonly used in photodynamic therapy for cancer treatment. We observed a saturable absorption process related to the excited singlet population, followed by a fast decay to the ground state. The optical excitation and subsequent relaxation were interpreted with a three-energy-level diagram, allowing the first singlet excited-state absorption cross section and lifetime determination. PACS 42.65.Sf; 78.66.Qn; 42.62.Be |
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