SAMOP 2023 – wissenschaftliches Programm

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SYHD: Symposium Molecules in Helium Droplets

SYHD 1: Molecules in Helium Droplets

SYHD 1.3: Hauptvortrag

Mittwoch, 8. März 2023, 12:00–12:30, E415

Clustering dynamics in superfluid helium nanodroplets: A theoretical study — •Nadine Halberstadt¹, Ernesto García Alfonso¹, Martí Pi^2,3, and Manuel Barranco^2,3 — ¹LCAR, CNRS and Université Toulouse 3, F-31062 Toulouse, France — ²Departament FQA, Facultat de Física, Universitat de Barcelona, Barcelona, Spain — ³Institute of Nanoscience and Nanotechnology (IN²UB), Universitat de Barcelona, Barcelona, Spain

In this work we study the collision of heliophilic atoms with a superfluid helium droplet, followed by their solvation and clustering. We use time-dependent Helium density functional theory (⁴He-TDDFT), which has proven to be the best compromise between accuracy and feasibility to study the stability and real time dynamics of doped helium droplets with a size comparable to experiments.

We also investigate the effect of the presence of a quantum vortex on the pickup and clustering process, in relation with the pioneering experiment by Vilesov’s group which used atom doping to visualize quantum vortices.

Our simulations reveal rather surprising final cluster configurations, very different from the gas phase ones. This is due to the fast cooling property associated to superfluidity, which quenches metastable configurations, and to the high density shell building around each dopant atom which can prevent dopant-dopant bond formation.

They also reproduce the attractivity of dopant atoms to the vortex lines, with a cluster building along them but in a final configuration very different from the gas phase one.