The S1←S0 00 transitions of phenol and the hydrogen bonded phenol~H2O!1 cluster have been studied by high resolution fluorescence excitation spectroscopy. All lines in the monomer spectrum are split by 5664 MHz due to the internal rotation of the 2OH group about the a axis. The barrier for this internal motion is determined in the ground and excited states; V29 5 1215 cm , and V2854710 cm . The...
