Phys. Rev. Lett. 88, 158101 (2002) [4 pages]Complex Local Dynamics in DNA on the Picosecond and Nanosecond Time ScalesReceived 28 June 2001; published 29 March 2002 Time-resolved Stokes shift measurements of the local structural relaxation of three DNA oligonucleotides are presented. Logarithmic relaxation is seen for over three decades in time (40 ps–40 ns), indicating a complex relaxation among a large number of conformational substates. The observed relaxation is the same in all the sequences. Sequence dependence of the localized dynamics of DNA does not appear within this time range. We infer that 30%–50% of the relaxation is faster than 40 ps, has a nonlogarithmic decay and has a sequence dependent amplitude. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.158101
DOI:
10.1103/PhysRevLett.88.158101
PACS:
87.15.He, 78.47.+p, 82.35.Pq, 87.14.Gg
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