Probing isotope effects in chemical reactions using single ions

Details Probing isotope effects in chemical reactions using single ions Probing isotope effects in chemical reactions using single ions

2008-02-20

arxiv.org/abs/0802.2797v1

Phys. Rev. Lett. 100, 243003 (2008)

Physics

Atomic Physics

4 pages, 4 figures. Submitted for publication

Scientific paper

10.1103/PhysRevLett.100.243003

Isotope effects in reactions between Mg+ in the 3p 2P3/2 excited state and molecular hydrogen at thermal energies are studied through single reaction events. From only ~250 reactions with HD, the branching ratio between formation of MgD+ and MgH+ is found to be larger than 5. From additional 65 reactions with H2 and D2 we find that the overall decay probability of the intermediate MgH2+, MgHD+ or MgD2+ complexes is the same. Our study shows that few single ion reactions can provide quantitative information on ion-neutral reactions. Hence, the method is well-suited for reaction studies involving rare species, e.g., rare isotopes or short-lived unstable elements.

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