Encyclopedia of Astrobiology

Living Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso

Kinetic Isotope Effect

  • Kensei Kobayashi
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_5240-1



A kinetic isotope effect ( KIE) is an effect observed due to differences in the chemical reaction rates of a molecule with a heavier isotope ( k H) relative to one containing a lighter isotope ( k L):
$$ KIE={k}_{\mathrm{L}}/{k}_{\mathrm{H}}. $$


Organic Carbon Isotopic Composition Isotopic Ratio Bioorganic Chemistry Isotopic Fractionation 
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© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Yokohama National UniversityYokohamaJapan