Hyperfine and Zeeman interactions in ultracold collisions of molecular hydrogen with atomic lithium
| Autor: | Jóźwiak, Hubert, Tscherbul, Timur V., Wcisło, Piotr |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | J. Chem. Phys. 160, 094304 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/5.0193148 |
| Popis: | 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. Comment: The following article has been accepted by The Journal of Chemical Physics. After it is published, it will be found at https://pubs.aip.org/aip/jcp |
| Databáze: | arXiv |
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