Feshbach resonances in cold collisions as a benchmark for state of the art ab initio theory

• URL: http://arxiv.org/abs/2408.13197v1
• Date: Fri, 23 Aug 2024 16:29:23 GMT
• Title: Feshbach resonances in cold collisions as a benchmark for state of the art ab initio theory
• Authors: Karl P. Horn, Meenu Upadhyay, Baruch Margulis, Daniel M. Reich, Edvardas Narevicius, Markus Meuwly, Christiane P. Koch,
• Abstract summary: Quantum resonances in collisions and reactions are a sensitive probe of the intermolecular forces. This raises the question whether the sensitivity of such measurements is sufficient to assess the quality of theoretical models for the interaction. We find that the ability to test the correct prediction of energy redistribution over molecular degrees of freedom is within reach, requiring only a modest improvement in energy resolution of current experiments.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum resonances in collisions and reactions are a sensitive probe of the intermolecular forces. They may dominate the final quantum state distribution, as recently observed for Feshbach resonances in a cold collision experiment (Science 380, 77 (2023)). This raises the question whether the sensitivity of such measurements is sufficient to assess the quality of theoretical models for the interaction. We here compare measured collision cross sections to those obtained with exact quantum coupled-channels scattering calculations for three different ab initio potential energy surfaces. We find that the ability to test the correct prediction of energy redistribution over molecular degrees of freedom is within reach, requiring only a modest improvement in energy resolution of current experiments. Such improvement will enable the separation of individual resonances and allow for an unambiguous experimental test of different theory approaches.

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