Rotational state changes in collisions of diatomic molecular ions with atomic ions

• URL: http://arxiv.org/abs/1905.02130v2
• Date: Tue, 29 Oct 2024 18:35:31 GMT
• Title: Rotational state changes in collisions of diatomic molecular ions with atomic ions
• Authors: J. Martin Berglund, Michael Drewsen, Christiane P. Koch,
• Abstract summary: We investigate rotational state changes in a single collision of diatomic molecular ions, both polar and apolar, with an atomic ion. Thanks to the different time and energy scales of translational and rotational motion, we may treat the collision classically and describe rotations quantum mechanically.
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• Abstract: We investigate rotational state changes in a single collision of diatomic molecular ions, both polar and apolar, with an atomic ion. These may occur when sympathetically cooling trapped molecular ions by co-trapped laser-cooled atomic ions, since the electric field due to the atom may excite molecular rotations. Thanks to the different time and energy scales of translational and rotational motion, we may treat the collision classically and describe rotations quantum mechanically. Based on numerical calculations for a number of examples, we derive closed-form estimates for the rotational excitation per collision, depending on the scattering energy and the molecular parameters.

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