Exciton Trapping Dynamics in DNA Multimers

Rocio Borrego-Varillas 1 Giulio Cerullo 1 Dimitra Markovitsi 2, 3
3 DICO - Biomolécules Excitées
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
Abstract : Using as a model the single adenine strand (dA)20, we study the ultrafast evolution of electronic excitations in DNA with a time resolution of 30 fs. Our transient absorption spectra in the UV and visible spectral domains show that internal conversion among photogenerated exciton states occurs within 100 fs. Subsequently, the ππ* states acquire progressively charge-transfer character before being completely trapped, within 3 ps, by fully developed charge-transfer states corresponding to transfer of an electron from one adenine moiety to another (A+A–).
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Rocio Borrego-Varillas, Giulio Cerullo, Dimitra Markovitsi. Exciton Trapping Dynamics in DNA Multimers. Journal of Physical Chemistry Letters, American Chemical Society, 2019, 10 (7), pp.1639-1643. ⟨10.1021/acs.jpclett.9b00450⟩. ⟨cea-02096303⟩

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