Dissociative recombination of rotationally cold ArH$^+$
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866913467096629248 |
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| author | Kálosi, Ábel Grieser, Manfred Isberner, Leonard W. Kreckel, Holger Larson, Åsa Neufeld, David A. Orel, Ann E. Paul, Daniel Savin, Daniel W. Schippers, Stefan Schmidt, Viviane C. Wolf, Andreas Wolfire, Mark G. Novotný, Oldřich |
| author_facet | Kálosi, Ábel Grieser, Manfred Isberner, Leonard W. Kreckel, Holger Larson, Åsa Neufeld, David A. Orel, Ann E. Paul, Daniel Savin, Daniel W. Schippers, Stefan Schmidt, Viviane C. Wolf, Andreas Wolfire, Mark G. Novotný, Oldřich |
| contents | We have experimentally studied dissociative recombination (DR) of electronically and vibrationally relaxed ArH$^+$ in its lowest rotational levels, using an electron--ion merged-beams setup at the Cryogenic Storage Ring. We report measurements for the merged-beams rate coefficient of ArH$^+$ and compare it to published experimental and theoretical results. In addition, by measuring the kinetic energy released to the DR fragments, we have determined the internal state of the DR products after dissociation. At low collision energies, we find that the atomic products are in their respective ground states, which are only accessible via non-adiabatic couplings to neutral Rydberg states. Published theoretical results for ArH$^+$ have not included this DR pathway. From our measurements, we have also derived a kinetic temperature rate coefficient for use in astrochemical models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_06808 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Dissociative recombination of rotationally cold ArH$^+$ Kálosi, Ábel Grieser, Manfred Isberner, Leonard W. Kreckel, Holger Larson, Åsa Neufeld, David A. Orel, Ann E. Paul, Daniel Savin, Daniel W. Schippers, Stefan Schmidt, Viviane C. Wolf, Andreas Wolfire, Mark G. Novotný, Oldřich Atomic Physics Chemical Physics We have experimentally studied dissociative recombination (DR) of electronically and vibrationally relaxed ArH$^+$ in its lowest rotational levels, using an electron--ion merged-beams setup at the Cryogenic Storage Ring. We report measurements for the merged-beams rate coefficient of ArH$^+$ and compare it to published experimental and theoretical results. In addition, by measuring the kinetic energy released to the DR fragments, we have determined the internal state of the DR products after dissociation. At low collision energies, we find that the atomic products are in their respective ground states, which are only accessible via non-adiabatic couplings to neutral Rydberg states. Published theoretical results for ArH$^+$ have not included this DR pathway. From our measurements, we have also derived a kinetic temperature rate coefficient for use in astrochemical models. |
| title | Dissociative recombination of rotationally cold ArH$^+$ |
| topic | Atomic Physics Chemical Physics |
| url | https://arxiv.org/abs/2408.06808 |