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Grussie F, Berger L, Grieser M, Kálosi Á, Müll D, Novotný O, Znotins A, Dayou F, Urbain X, Kreckel H. Merged-Beams Study of the Reaction of Cold HD^{+} with C Atoms Reveals a Pronounced Intramolecular Kinetic Isotope Effect. PHYSICAL REVIEW LETTERS 2024; 132:243001. [PMID: 38949364 DOI: 10.1103/physrevlett.132.243001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 02/28/2024] [Accepted: 03/19/2024] [Indexed: 07/02/2024]
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 H_{2}^{+} and D_{2}^{+} 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.
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Affiliation(s)
- Florian Grussie
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Lukas Berger
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Manfred Grieser
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Ábel Kálosi
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- Columbia Astrophysics Laboratory, Columbia University, New York, New York 10027, USA
| | - Damian Müll
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Oldřich Novotný
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Aigars Znotins
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Fabrice Dayou
- Sorbonne Université, Observatoire de Paris, PSL University, CNRS, LERMA, F-92195 Meudon, France
| | - Xavier Urbain
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
| | - Holger Kreckel
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
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Song JB, Gislason EA. Theoretical study of collision-induced dissociation in state-selected collisions of H2+(v)+Ar and HD+(v)+Ar. Chem Phys 2003. [DOI: 10.1016/s0301-0104(03)00328-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Song JB. Theoretical Study of the Isotope Effect for the Reaction Cl+HD at the High Energy Using Pairwise Energy Model. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2003. [DOI: 10.5012/jkcs.2003.47.3.191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Song JB. Theoretical study of collision-induced dissociation cross-sections for the reactions , Cl, and F). Chem Phys 2002. [DOI: 10.1016/s0301-0104(02)00834-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Song JB, Gislason EA. Theoretical study of the effect of reagent rotation and vibration on the reactions of Cl+H2 and Cl+HD. Chem Phys 1998. [DOI: 10.1016/s0301-0104(98)00205-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Sizun M, Song JB, Gislason EA. Theoretical study of the reactions of Ar++H2 and Ar++HD using the trajectory surface hopping method. J Chem Phys 1998. [DOI: 10.1063/1.477092] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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Song JB, Gislason EA. Application of the pairwise energy model to various isotopic variations of the H + H2 reaction. Chem Phys 1997. [DOI: 10.1016/s0301-0104(96)00297-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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