Distinct fates: For adenine in (dA)10, the internal conversion to the ground state is dominated by an S0/S1 conical intersection with a strong out-of-plane deformation of the amino group (left). In (dA)10⋅(dT)10, this channel is suppressed by adenine–thymine hydrogen bonding (right). The excited-state lifetimes of adenine are computed to be ten times longer in DNA strands than in vacuo or in water.
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Lü et al. (2011) studied this question.
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