Role of Long Range Interactions in Low-Temperature Molecular Reactive Collisions. – (Yohann SCRIBANO / LCPQ / Seminar). – 17/12/2024, 14H

Séminaire LCPQ

Yohann SCRIBANO University of Montpellier

Salle de séminaire, 3R1, 3ème étage

Abstract
Cold and ultra-cold molecular systems are attracting the attention of researchers because the quantum nature of matter manifests itself clearly under these conditions, and research into such systems provides new insight into the quantum theory of matter and matter-light interaction. Experimental techniques for cooling, trapping and colliding cold and ultra-cold molecules continue to develop at an astounding pace. The applications of those investigations include for example, observing explicit quantum effects in chemical reactivity, developing an understanding of chemistry in cold astrophysical media and the use of very high-precision measurement to answer fundamental physics questions. Thus, an accurate theoretical treatment of cold chemical reactions is needed for the understanding of the reaction mechanisms and interpreting the experimental measurements.
In the case of ion-neutral chemical reactions, a proper description of long range interactions is crucial for an accurate estimation of the reactive scattering process. The impact of accurate ab initio potentials will be highlighted by a rigorous study using of various classical, quantum and statistical numerical method on the chemical reaction H + HeH$^{+}\rightarrow$ H$^{+}_2$ + He of interest in the context of early-universe chemistry.