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Hybrid ion-atom systems provide an excellent platform for studies ofstate-resolved quantum chemistry at low temperatures, where quantum effects maybe prevalent. Here we study theoretically the process of vibrational relaxationof an initially weakly bound molecular ion due to collisions with thebackground gas atoms. We show that this inelastic process is governed by theuniversal long-range part of the interaction potential, which allows for usingsimplified model potentials applicable to multiple atomic species. The productdistribution after the collision can be estimated by making use of thedistorted wave Born approximation. We find that the inelastic collisions leadpredominantly to small changes in the binding energy of the molecular ion.

Vibrational quenching of cold molecular ions immersed in their parent gas