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Isotope effects on the excited-state dynamics of single- and double-stranded GC-containing DNAs were studied by femtosecond transient absorption spectroscopy. A pronounced deuterium isotope effect was observed in alternating d(GC)(9).d(GC)(9), but none was seen in the nonalternating or single-stranded variations investigated. These findings demonstrate that an interstrand process involving proton-coupled electron transfer contributes to the excited-state dynamics in DNAs having an appropriate base sequence.

Deuterium Isotope Effect on Excited-State Dynamics in an Alternating GC Oligonucleotide