Hannover 2016 – scientific programme

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MO: Fachverband Molekülphysik

MO 21: Cold Molecules & Helium Droplets 2

MO 21.5: Talk

Friday, March 4, 2016, 12:15–12:30, f142

Imaging desorption dynamics of rubidium atoms attached to helium nanodroplets — •Johannes von Vangerow¹, Antonio Leal², Manuel Barranco^2,3, Nadine Halberstadt³, François Coppens³, Martí Pi², Frank Stienkemeier¹, and Marcel Mudrich¹ — ¹Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany — ²Departament ECM, Facultat de Física, and IN²UB, Universitat de Barcelona. Diagonal 645, 08028 Barcelona, Spain — ³Laboratoire des Collisions, Agrégats, Réactivité, IRSAMC,UMR 5589, CNRS et Université Paul Sabatier-Toulouse 3, 118 route de Narbonne, F-31062 Toulouse Cedex 09, France

This contribution will focus on photo-induced dynamics of rubidium (Rb) atoms attached to the surface of quantumfluid helium nanodroplets. A femtosecond (fs) pump-probe sequence is initiated by resonant excitation to droplet perturbed states correlating to the Rb 6p and 5p atomic orbitals. Subsequently, a fs probe pulse ionises the Rb atom and velocity map ion and electron images are recorded. Depending on excitation wavelength and pump-probe delay, dynamics involving either desorption or submersion as well as formation of Rb⁺He_n=1,2 complexes are observed. The experimental results will be discussed and compared to simulations based on time dependent density functional theory.