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  1. Reactive scattering calculations for 87Rb + 87RbHe → Rb2(3Σ$$^{+}_{u}$$,v) + He from ultralow to intermediate energies

    We investigate atom-diatom reactive collisions, as a preliminary step, in order to assess the possibility of forming Rb2 molecules in their lowest triplet electronic state by cold collisions of rubidium atoms on the surface of helium nanodroplets. A simple model related to the well-known Rosen treatment of linear triatomic molecules in relative coordinates is used, allowing to estimate reactive probabilities for different values of the total angular momentum. The best available full dimensional potential energy surface is employed through the calculations. Noticeable values of the probabilities in the ultracold regime, which numerically fulfill the Wigner threshold law, support the feasibilitymore » of the process. Here, the rubidium dimer is mainly produced at high vibrational states, and the reactivity is more efficient for a bosonic helium partner than when the fermion species is considered.« less

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