Abstract
We have shown1 that long-lived excited electronic states known as excimers2, which arise from base stacking3, are formed in high yields in a variety of synthetic DNA oligonucleotides. Markovitsi . 4 question our interpretation, and claim that these states can be accounted for by their exciton theory. However, neither this nor their emission data contradict our finding that in single- and double-stranded A·T (adenine–thymine-paired) DNA, excited states decay through long-lived intermediate states in which excitation is shared by stacked bases.
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