Ultrafast Internal Conversion of Excited Cytosine via the Lowest ππ* Electronic Singlet State
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- 14 June 2003
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 125 (27) , 8108-8109
- https://doi.org/10.1021/ja0351600
Abstract
Computational evidence at the CASPT2 level supports that the lowest excited state ππ* contributes to the S1/S0 crossing responsible for the ultrafast decay of singlet excited cytosine. The computed radiative lifetime, 33 ns, is consistent with the experimentally derived value, 40 ns. The nOπ* state does not play a direct role in the rapid repopulation of the ground state; it is involved in a S2/S1 crossing. Alternative mechanisms through excited states πσ* or nNπ* are not competitive in cytosine.This publication has 10 references indexed in Scilit:
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