Picosecond transient infrared study of the ultrafast deactivation processes of electronically excited B-DNA and Z-DNA forms of [poly(dG-dC)]2.

[摘要]：Very fast UV excitation of the right- handed B form or the left-handed Z form of [poly(dG-dC)]2 results in transient IR absorption bands that remain long after the 1pp* state is predicted to have decayed. A biexponential decay is obsd. for B-DNA, which is assigned to the vibrationally excited ground state and the 1hNp* state. The Z-DNA decay of Z-DNA is dominated by single-exponential decay, which is assigned to an exciplex state.

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