Unveiling shape resonances in H + HF collisions at cold energies

Abstract

Resonances are associated with the trapping of an intermolecular complex, and are characterized by a series of quantum numbers such as the total angular momentum and the parity, representative of a specific partial wave. Here we show how at cold temperatures the rotational quenching of HF(j=1,2) with H is strongly influenced by the presence of manifolds of resonances arising from the combination of a single value of the orbital angular momentum with different total angular momentum values. These resonances give rise up to a two-fold increase in the thermal rate coefficient at the low temperatures characteristic of the interstellar medium. Our results show that by selecting the relative geometry of the reactants by alignment of the HF rotational angular momentum, it is possible to decompose the resonance peak, disentangling the contribution of different total angular momenta to the resonance.

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Cited by in corpus (4)

• The role of low energy resonances in the stereodynamics of cold He+D2 collisions
• Stereodynamical control of cold collisions between two aligned D2 molecules
• Stereodynamic control of cold rotationally inelastic CO + HD collisions
• On the use of stereodynamical effects to control cold chemical reactions: the H + D${}_2⟷$ D + HD case study