Blue copper proteins charge transfer excitation

An extremely fast relaxation of the 625 nm charge-transfer absorption band of the blue copper protein, azumin, has been studied by subpicosecond light pulses.The blue protein solution is transiently bleached but the absorption reversibly reappears with a time constant of 1.6 0.2 ps) owing to reverse charge-transfer. A fast transient (<0.5ps) is attributed to excited-state vibrational relaxation/internal conversion. Hydrophobic properties of phtyochrome have been examined using 8-anilinonaphthalene-l-sulphonate as probe. ... 

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