SAMOP 2021 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 8: Cold Molecules

MO 8.2: Vortrag

Freitag, 24. September 2021, 11:00–11:15, H1

Formation of van der Waals molecules in buffer gas cells through direct three-body recombination — •Marjan Mirahmadi¹ and Jesús Pérez-Ríos^1,2 — ¹Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany — ²Department of Physics, Stony Brook University, Stony Brook, New York 11794, USA

We study the formation of van der Waals (vdW) molecules through direct three-body recombination processes A + B + B → AB + B. In particular, the three-body recombination rate at temperatures relevant for buffer gas cell experiments is calculated via a classical trajectory method in hyperspherical coordinates [J. Chem. Phys., 140, 044307 (2014)]. Furthermore, investigating the role of pairwise long-range interactions between the atoms involved, we could establish an exact threshold law for the formation rate of vdW molecules as a function of long-range dispersion coefficients of the pairwise interactions [arXiv:2107.02048 (2021)]. To study some examples we focus on the formation of vdW molecules X-RG (where RG is a rare gas atom) via X + RG + RG → X-RG + RG collisions [J. Chem. Phys., 154, 034305 (2021)]. As a result, we show that almost any X-RG molecule should appear in a buffer gas cell under appropriate conditions. It is pretty remarkable that, despite the drastic differences in the properties of the atom, X, and parameters of X-RG interaction potentials, the recombination rates are of the same order of magnitude.