Journal
CHEMICAL PHYSICS
Volume 254, Issue 2-3, Pages 349-361Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0301-0104(00)00048-3
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The rotationally resolved S-1 <-- S-0 electronic spectrum of the hydrogen-bonded phenol-methanol cluster has been analyzed. Due to the internal rotation of the methyl group in the methanol moiety, the spectrum of the electronic origin of phenol-methanol is split into A and E subtorsional bands. From a perturbation analysis of the torsional-rotational structure of the electronic origin, the threefold barriers to internal rotation of the methyl group could be determined to be 170 cm(-1) in the S-0 state and 150 cm(-1) in the S-1 state. The perturbation analysis yielded the angle between the internal rotor axis and the inertial axes of the cluster, which allows the determination of the geometry of the hydrogen bond in both electronic states. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
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