Hyperfine and Zeeman interactions in ultracold collisions of molecular hydrogen with atomic lithium
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| Autores principales: | , , |
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| Formato: | Preprint |
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2023
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| _version_ | 1866916147203407872 |
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| author | Jóźwiak, Hubert Tscherbul, Timur V. Wcisło, Piotr |
| author_facet | Jóźwiak, Hubert Tscherbul, Timur V. Wcisło, Piotr |
| contents | We present a rigorous quantum scattering study of the effects of hyperfine and Zeeman interactions on cold Li - H$_{2}$ collisions in the presence of an external magnetic field using a recent ab initio potential energy surface. We find that the low-field-seeking states of H$_{2}$ predominantly undergo elastic collisions: the ratio of elastic-to-inelastic collisions exceeds 100 for collision energies below 1.5 K. Furthermore, we demonstrate that most inelastic collisions conserve the space-fixed projection of the nuclear spin. We show that the anisotropic hyperfine interaction between the nuclear spin of H$_{2}$ and the electron spin of Li can have a significant effect on inelastic scattering in the ultracold regime, as it mediates two processes: the electron spin relaxation in lithium, and the nuclear spin - electron spin exchange. Given the predominance of elastic collisions and the propensity of inelastic collisions to retain H$_{2}$ in its low-field-seeking states, our results open up the possibility of sympathetic cooling of molecular hydrogen by atomic lithium, paving the way for future exploration of ultracold collisions and high-precision spectroscopy of H$_{2}$ molecules. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_13652 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Hyperfine and Zeeman interactions in ultracold collisions of molecular hydrogen with atomic lithium Jóźwiak, Hubert Tscherbul, Timur V. Wcisło, Piotr Chemical Physics Atomic Physics Quantum Physics We present a rigorous quantum scattering study of the effects of hyperfine and Zeeman interactions on cold Li - H$_{2}$ collisions in the presence of an external magnetic field using a recent ab initio potential energy surface. We find that the low-field-seeking states of H$_{2}$ predominantly undergo elastic collisions: the ratio of elastic-to-inelastic collisions exceeds 100 for collision energies below 1.5 K. Furthermore, we demonstrate that most inelastic collisions conserve the space-fixed projection of the nuclear spin. We show that the anisotropic hyperfine interaction between the nuclear spin of H$_{2}$ and the electron spin of Li can have a significant effect on inelastic scattering in the ultracold regime, as it mediates two processes: the electron spin relaxation in lithium, and the nuclear spin - electron spin exchange. Given the predominance of elastic collisions and the propensity of inelastic collisions to retain H$_{2}$ in its low-field-seeking states, our results open up the possibility of sympathetic cooling of molecular hydrogen by atomic lithium, paving the way for future exploration of ultracold collisions and high-precision spectroscopy of H$_{2}$ molecules. |
| title | Hyperfine and Zeeman interactions in ultracold collisions of molecular hydrogen with atomic lithium |
| topic | Chemical Physics Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2312.13652 |