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Schultz, Thomas
CRASY(Correlated Rotational Alignment Spectroscopy)
Research Interests
  • Correlated spectroscopy

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Analysis of ultrafast relaxation in photoexcited DNA base pairs of adenine and thymine

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Title
Analysis of ultrafast relaxation in photoexcited DNA base pairs of adenine and thymine
Author
Samoylova, E.Schultz, ThomasHertel, I.V.Radloff, W.
Keywords
Adenine; DNA photochemistry; Excited state relaxation; Internal conversion; Multiphoton ionization; Thymine; Time-resolved spectroscopy
Issue Date
200805
Publisher
ELSEVIER SCIENCE BV
Citation
CHEMICAL PHYSICS, v.347, no.1-3, pp.376 - 382
Abstract
The photoinduced dynamics in base pairs of adenine and thymine were analyzed by femtosecond pump-probe spectroscopy. On the short-time scale up to a few picoseconds, the characteristic time constants for the dimers are quite similar to the corresponding values of the monomers. This leads to the conclusion that ultrafast intramolecular relaxation proceeds via ππ* and nπ* states of one component within the dimer. On the long-time scale, we obtained a novel time constant of roughly 40 ps for the thymine dimer and the adenine-thymine base pair. This time constant was never observed in the monomers and is tentatively assigned to an intermolecular relaxation process, possibly via a hydrogen transfer state.
URI
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DOI
http://dx.doi.org/10.1016/j.chemphys.2007.09.046
ISSN
0301-0104
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