Abstract
The observed isotope fractionation factor, α, for deuterium isotope exchange between liquid acetic acid and hydrogen gas is compared with a value of a calculated on the basis of a harmonic force field for the dimer. The calculated value of a is found to be about 30 % higher than the observed value. The discrepancy is considered to be due to the neglect of anharmonic coupling between the hydroxyl bond stretching- and the hydrogen bond stretching vibrations of the dimer.
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