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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/2602.09142 |
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| _version_ | 1866910017433632768 |
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| author | Patel, Swapnil Sardar, Dibyendu Saraladevi, Jyothi Tomza, Michał Brown, Kenneth R. |
| author_facet | Patel, Swapnil Sardar, Dibyendu Saraladevi, Jyothi Tomza, Michał Brown, Kenneth R. |
| contents | We report the observation of charge-exchange collisions between trapped calcium monohydride molecular ions ($^{40}$CaH$^+$) and ultracold potassium atoms ($^{39}$K) in a hybrid ion-atom trap. The measured charge-exchange rate coefficient is significantly suppressed relative to the Langevin rate constant for the system. We use quantum-chemical calculations to model the (CaH-K)$^+$ system in the ground and excited electronic states and to identify possible charge-exchange mechanisms. Our calculations do not fully explain the measured rate, highlighting the need for a full-dimensional quantum treatment that includes vibrational motion and intermediate complex formation. Our work demonstrates that cold hybrid ion-atom platforms with molecular ions enable access to richer chemical complexity and collisional dynamics inaccessible in purely atomic systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_09142 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Charge Exchange Dynamics in Cold Collisions of $^{40}$CaH$^+$ and $^{39}$K Patel, Swapnil Sardar, Dibyendu Saraladevi, Jyothi Tomza, Michał Brown, Kenneth R. Atomic Physics Chemical Physics We report the observation of charge-exchange collisions between trapped calcium monohydride molecular ions ($^{40}$CaH$^+$) and ultracold potassium atoms ($^{39}$K) in a hybrid ion-atom trap. The measured charge-exchange rate coefficient is significantly suppressed relative to the Langevin rate constant for the system. We use quantum-chemical calculations to model the (CaH-K)$^+$ system in the ground and excited electronic states and to identify possible charge-exchange mechanisms. Our calculations do not fully explain the measured rate, highlighting the need for a full-dimensional quantum treatment that includes vibrational motion and intermediate complex formation. Our work demonstrates that cold hybrid ion-atom platforms with molecular ions enable access to richer chemical complexity and collisional dynamics inaccessible in purely atomic systems. |
| title | Charge Exchange Dynamics in Cold Collisions of $^{40}$CaH$^+$ and $^{39}$K |
| topic | Atomic Physics Chemical Physics |
| url | https://arxiv.org/abs/2602.09142 |