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

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Dynamics of photoinduced processes in adenine and thymine base pairs

Cited 64 times inthomson ciCited 68 times inthomson ci
Title
Dynamics of photoinduced processes in adenine and thymine base pairs
Author
Samoylova, E.Lippert, H.Ullrich, S.Hertel, I.V.Radloff, W.Schultz, Thomas
Keywords
RESOLVED PHOTOELECTRON-SPECTROSCOPY; EXCITED-STATE; HYDROGEN-TRANSFER; AB-INITIO; NONRADIATIVE DECAY; LASER SPECTROSCOPY; DNA BASES; IONIZATION; MECHANISM; DIMER
Issue Date
200502
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.127, no.6, pp.1782 - 1786
Abstract
The excited-state dynamics of adenine and thymine dimers and the adenine-thymine base pair were investigated by femtosecond pump-probe ionization spectroscopy with excitation wavelengths of 250-272 nm. The base pairs showed a characteristic ultrafast decay of the initially excited ππ* state to an nπ* state (lifetime τππ• ≈ 100 fs) followed by a slower decay of the latter with τnπ* ≈ 0.9 ps for (adenine)2, τnπ* = 6-9 ps for (thymine)2, and τnπ* ≈ 2.4 ps for the adenine-thymine base pair. In the adenine dimer, a competing decay of the ππ* state via the πσ* state greatly suppressed the nπ* state signals. Similarities of the excited-state decay parameters in the isolated bases and the base pairs suggest an intramonomer relaxation mechanism in the base pairs.
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DOI
http://dx.doi.org/10.1021/ja044369q
ISSN
0002-7863
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