Isotopic Fractionation by Ion-Molecule Reactions |
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Authors: | Herbst Eric |
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Institution: | (1) Departments of Physics and Astronomy, The Ohio State University, Columbus, OH 43210, USA |
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Abstract: | Isotopic fractionation in interstellar clouds can occur by ion-molecule reactions at low temperatures. The major effect is
not kinetic but thermodynamic in origin in that it arises from the difference in rate coefficients between forward and backward
directions in reactions which exchange isotopic atoms. In this article, we concentrate on deuterium fractionation in interstellar
clouds; this effect enhances the relative abundances of deuterated isotopomers to their normal counterparts by up to four
orders of magnitude as compared with the basic D/H elemental abundance ratio. We also discuss the fractionation of 15N and 13C.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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