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Issue 33, 2010
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Excimer states in microhydrated adenine clusters

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We present femtosecond pumpprobe mass and photoelectron spectra for adenine (A) and microhydrated Am(H2O)n clusters. Three distinct relaxation processes of photoexcited electronic states were distinguished: in unhydrated A, relaxation of the optically bright ππ* state occurred via the dark nπ* state with respective lifetimes of <0.1 and 1.3 ps. In microhydrated clusters A(H2O)n, relaxation via the nπ* state is quenched by a faster relaxation process, probably involving πσ* states. For the predominantly hydrogen-bonded adenine dimer (A2), 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 π-stacked clusters. From the electron spectra we estimate adiabatic ionization potentials of 8.32 eV (A), 8.27 eV (A(H2O)1), 8.19 eV (A(H2O)2), 8.10 eV (A(H2O)3), 8.18 eV (A2), and 8.0 eV (A2(H2O)3–5).

Graphical abstract: Excimer states in microhydrated adenine clusters

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Publication details

The article was received on 08 Mar 2010, accepted on 21 Apr 2010 and first published on 16 Jun 2010

Article type: Paper
DOI: 10.1039/C003967E
Citation: Phys. Chem. Chem. Phys., 2010,12, 9632-9636

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    Excimer states in microhydrated adenine clusters

    V. R. Smith, E. Samoylova, H.-H. Ritze, W. Radloff and T. Schultz, Phys. Chem. Chem. Phys., 2010, 12, 9632
    DOI: 10.1039/C003967E

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