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The jet-cooled 1:1 complex of phenol and ethanol was studied by several laser spectroscopic techniques and ab initio calculations at the Hartree−Fock 6-31G(d,p) level. The laser-induced fluorescence (LIF) and mass-selected resonant two-photon ionization (R2PI) spectra showed that the electronic S 1 ← S 0 origin consists of two transitions separated by 2 cm -1 . The dispersed fluorescence (DF) and IR−UV and UV−IR double-resonance spectra reveal that these transitions are the electronic origins of two different isomers. The ab initio calculations yield three minimum energy structures of anti/gauche conformers of the ethanol moiety in the hydrogen-bonded cluster. The comparison of the experimental and theoretical results allows an assignment of the spectral features to the calculated rotamer structures.
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Spangenberg et al. (1999) studied this question.
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