Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 14: Cold Molecules 2

MO 14.3: Vortrag

Mittwoch, 25. März 2015, 15:15–15:30, PH/HS1

Time resolved photoion/electron imaging spectroscopy of Rubidium atoms attached to Helium nanodroplets — •Johannes von Vangerow, Oliver John, Frank Stienkemeier, and Marcel Mudrich — Physikalisches Institut, Universität Freiburg, Hermann-Herderstr. 3, 79104 Freiburg, Germany

This presentation will focus on a metallic dopand, Rubidium, forming a bound surface state with a liquid Helium nanodroplet. In a femtosecond pump probe experiment, we trigger the desorption of the dopand via resonant exitation of the surface state, i.e. the 6PΣ and 6PΠ states in the pseudodiatomic model approach.
By subsequent ionization of the dopand and time of flight mass detection up to 6.4·10⁴ amu, we observe solvation dynamics of the Rb⁺ occuring for delay times ≤1 ps. Mass selected velocity map images of the desorbed Rb⁺ and RbHe⁺ photofragments show an increasing kinetic energy and anisotropy leveling out at t≤10 ps for all exitation wavelenghs. Vice versa, photoelectron images show a decreasing energy asymptotically reaching the corresponding atomic transition.
The experimental results will be compared to a semiclassical model particularly focusing on the RbHe⁺ formation dynamics involving assoziative photoionization.