Merged-Beams Study of the Reaction of Cold HD+ with C Atoms Reveals a Pronounced Intramolecular Kinetic Isotope Effect
(2024) Physical Review Letters — Vol. 132, n° 24, p. 243001-1 - 7 (2024)
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- Authors
Grussie, Florian 
Berger, Lukas Grieser, Manfred Kálosi, Ábel Kreckel, Holger
- Abstract
- We present a merged-beams study of reactions between HD+ ions, stored in the Cryogenic Storage Ring (CSR), and laser-produced ground-term C atoms. The molecular ions are stored for up to 20 s in the extreme vacuum of the CSR, where they have time to relax radiatively until they reach their vibrational ground state (within 0.5 s of storage) and rotational states with J ≤ 3 (after 5 s). We combine our experimental studies with quasiclassical trajectory calculations based on two reactive potential energy surfaces. In contrast to previous studies with internally excited H2+ and D2+ ions, our results reveal a pronounced isotope effect, favoring the production of CH+ over CD+ across all collision energies, and a significant increase in the absolute rate coefficient of the reaction. Our experimental results agree well with our theoretical calculations for vibrationally relaxed HD+ ions in their lowest rotational states.
- Affiliations
Citations
Grussie, F., Berger, L., Grieser, M., Kálosi, Á., Müll, D., Novotný, O., Znotins, A., Dayou, F., Urbain, X., & Kreckel, H. (2024). Merged-Beams Study of the Reaction of Cold HD+ with C Atoms Reveals a Pronounced Intramolecular Kinetic Isotope Effect. Physical Review Letters, 132(24), 243001-1 - 7. https://doi.org/10.1103/physrevlett.132.243001 (Original work published 2024)