Electronic excitation energy transfer between nucleobases of natural DNA |
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Authors: | Ignacio Vayá Thomas Gustavsson Thierry Douki Yuri Berlin Dimitra Markovitsi |
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Affiliation: | CNRS, IRAMIS, SPAM, Laboratoire Francis Perrin, URA 2453, F-91191 Gif-sur-Yvette, France. |
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Abstract: | Transfer of the electronic excitation energy in calf thymus DNA is studied by time-resolved fluorescence spectroscopy. The fluorescence anisotropy, after an initial decay starting on the femtosecond time scale, dwindles down to ca. 0.1. The in-plane depolarized fluorescence decays are described by a stretched exponential law. Our observations are consistent with one-dimensional transfer mediated by charge-transfer excited states. |
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