isotopic fractionation factor

isotopic fractionation factor

The ratio (x₁/x₂)_A/(x₁/x₂)_B, where x is the abundance, expressed as the atom fraction of the isotope distinguished by the subscript numeral, when the two isotopes are equilibrated between two different chemical species A and B (or between specific sites A and B in the same or different chemical species). The term is most commonly met in connection with deuterium solvent isotope effects, when the fractionation factor φ expresses the ratio

φ = (x_D/x_H)_solute/(x_D/x_H)_solvent

for the exchangeable hydrogen atoms in the chemical species (or sites) concerned. The concept is also applicable to transition states.

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Industry/Domain: Chemistry
Category: Physical organic chemistry
Organization: IUPAC
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