Rotational state changes in collisions of diatomic molecular ions with atomic ions
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arXiv
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| Format: | Preprint |
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2019
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| _version_ | 1866910136570740736 |
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| author | Berglund, J. Martin Drewsen, Michael Koch, Christiane P. |
| author_facet | Berglund, J. Martin Drewsen, Michael Koch, Christiane P. |
| contents | We investigate rotational state changes in a single collision of diatomic molecular ions, polar or apolar, with an atomic ion. Rotational state changes may occur since the angular degree of freedom of the molecular ions interacts with the electric field due to the atomic ion. Thanks to the very different time and energy scales of translational and rotational motion, we may treat the collision classically and describe only the rotations quantum mechanically. We first investigate a number of example systems numerically and then derive closed-form approximations for the rotational excitation per collision, depending on the scattering energy and the molecular parameters. These findings provide the basis for estimating the accumulated rotational excitation in sympathetic cooling of molecular ions by laser-cooled atomic ions [arXiv:2410.22458 ] which involves many single collisions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_1905_02130 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Rotational state changes in collisions of diatomic molecular ions with atomic ions Berglund, J. Martin Drewsen, Michael Koch, Christiane P. Quantum Physics Atomic Physics We investigate rotational state changes in a single collision of diatomic molecular ions, polar or apolar, with an atomic ion. Rotational state changes may occur since the angular degree of freedom of the molecular ions interacts with the electric field due to the atomic ion. Thanks to the very different time and energy scales of translational and rotational motion, we may treat the collision classically and describe only the rotations quantum mechanically. We first investigate a number of example systems numerically and then derive closed-form approximations for the rotational excitation per collision, depending on the scattering energy and the molecular parameters. These findings provide the basis for estimating the accumulated rotational excitation in sympathetic cooling of molecular ions by laser-cooled atomic ions [arXiv:2410.22458 ] which involves many single collisions. |
| title | Rotational state changes in collisions of diatomic molecular ions with atomic ions |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/1905.02130 |