Non-adiabatically driven quantum interference effects in the ultracold K + KRb $\longrightarrow$ Rb + K$_{2}$ chemical reaction
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909632996311040 |
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| author | Silva Jr., H. da Kendrick, B. K. Li, H. Kotochigova, S. Balakrishnan, N. |
| author_facet | Silva Jr., H. da Kendrick, B. K. Li, H. Kotochigova, S. Balakrishnan, N. |
| contents | The K + KRb $\longrightarrow$ Rb + K$_{2}$ chemical reaction is the first ultracold atom-diatom chemical reaction for which experimental results have been reported for temperatures below 1 $μ$K more than a decade ago. The reaction occurs through coupling with an excited electronic state that is accessible even in the ultracold limit. A previous quantum dynamics study, excluding non-adiabatic effects, has reported a rate coefficient that is about 35\% below the experimental value. Here, we report the first non-adiabatic quantum dynamics study of this reaction and obtain rate coefficients in better agreement with experiments. Our results show that short-range dynamics mediated by coupling with the excited electronic state introduces quantum interference effects that influence both the state-to-state rate coefficients and the overall reaction rates. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_01831 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Non-adiabatically driven quantum interference effects in the ultracold K + KRb $\longrightarrow$ Rb + K$_{2}$ chemical reaction Silva Jr., H. da Kendrick, B. K. Li, H. Kotochigova, S. Balakrishnan, N. Chemical Physics Atomic and Molecular Clusters Quantum Physics The K + KRb $\longrightarrow$ Rb + K$_{2}$ chemical reaction is the first ultracold atom-diatom chemical reaction for which experimental results have been reported for temperatures below 1 $μ$K more than a decade ago. The reaction occurs through coupling with an excited electronic state that is accessible even in the ultracold limit. A previous quantum dynamics study, excluding non-adiabatic effects, has reported a rate coefficient that is about 35\% below the experimental value. Here, we report the first non-adiabatic quantum dynamics study of this reaction and obtain rate coefficients in better agreement with experiments. Our results show that short-range dynamics mediated by coupling with the excited electronic state introduces quantum interference effects that influence both the state-to-state rate coefficients and the overall reaction rates. |
| title | Non-adiabatically driven quantum interference effects in the ultracold K + KRb $\longrightarrow$ Rb + K$_{2}$ chemical reaction |
| topic | Chemical Physics Atomic and Molecular Clusters Quantum Physics |
| url | https://arxiv.org/abs/2506.01831 |