The origin of the S1←S0electronic transition and the adiabatic ionization energy of p-fluorophenol are determined to be 35117±2 and 68577±5 cm-1, which are lower than those of phenol by 1232 and 48 cm-1, respectively. Most of the active vibrations in the electronic excited S1and cationic ground D0states are related to the in-plane ring modes. The p-fluoro substitution not only causes red shifts in the transition energies but also leads to a decrease in the frequencies of the observed vibrations. The present experimental findings are well supported by our ab initio and density functional calculations. © 2004 Elsevier B.V. All rights reserved.
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