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

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Excimer states in microhydrated adenine clusters

Cited 13 times inthomson ciCited 11 times inthomson ci
Title
Excimer states in microhydrated adenine clusters
Author
Smith, V. R.Samoylova, E.Ritze, H. -H.Radloff, W.Schultz, Thomas
Keywords
RESOLVED PHOTOELECTRON-SPECTROSCOPY; EXCITED SINGLET-STATES; DNA-BASE HOMODIMERS; MOLECULAR-DYNAMICS; DOUBLE HELICES; AB-INITIO; FEMTOSECOND SPECTROSCOPY; ELECTRONIC-STRUCTURE; ENERGY-TRANSFER; PAIRS
Issue Date
201009
Publisher
ROYAL SOC CHEMISTRY
Citation
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.12, no.33, pp.9632 - 9636
Abstract
We present femtosecond pump-probe mass and photoelectron spectra for adenine (A) and microhydrated A(m)(H(2)O)(n) clusters. Three distinct relaxation processes of photoexcited electronic states were distinguished: in unhydrated A, relaxation of the optically bright pi pi* state occurred via the dark n pi* state with respective lifetimes of <0.1 and 1.3 ps. In microhydrated clusters A(H(2)O)(n), relaxation via the n pi* state is quenched by a faster relaxation process, probably involving pi sigma* states. For the predominantly hydrogen-bonded adenine dimer (A(2)), excited state relaxation is dominated by monomer-like processes. When the adenine dimer is clustered with several water molecules, we observe a nanosecond lifetime from excimer states in pi-stacked clusters. From the electron spectra we estimate adiabatic ionization potentials of 8.32 eV (A), 8.27 eV (A(H(2)O)(1)), 8.19 eV (A(H(2)O)(2)), 8.10 eV (A(H(2)O)(3)), 8.18 eV (A(2)), and 8.0 eV (A(2)(H(2)O)(3-5)).
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DOI
http://dx.doi.org/10.1039/c003967e
ISSN
1463-9076
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