Hannover 2020 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 9: Poster Session - Atomic Physics I

A 9.5: Poster

Montag, 9. März 2020, 16:00–18:00, Empore Lichthof

Supersonic Molecular Beam for Velocity Map Imaging Experiments: Model Simulations and Design Concept — •Philipp Thurau, Kevin Eickhoff, Lars Englert, Tim Bayer, and Matthias Wollenhaupt — Carl von Ossietzky Universität Oldenburg, Institut für Physik, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg

The spatial phase shift in a focused laser beam, known as the Gouy phase, is a limiting factor for carrier envelope phase (CEP) sensitive experiments using velocity map imaging (VMI) techniques due to the large acceptance volume of VMI spectrometers. In order to minimize focal CEP averaging, we plan to utilize a skimmed supersonic molecular beam to confine the interaction region of our VMI spectrometer. Employing a well-established Monte Carlo method (see G. A. Bird & J. M. Brady, Molecular gas dynamics and the direct simulation of gas flows, Clarendon Press, Oxford (1994)), we simulate flow trajectories of a supersonic beam through different instrumental geometries, including a differentially pumped multi-chamber configuration and a VMI design where the nozzle is integrated in the repeller electrode (Ghafur et al.: Rev. Sci. Instrum., 80, 033110 (2009)). In view of future studies of the photoelectron circular dichroism of chiral molecules, we optimize the system parameters for particle density and beam temperatures. Initial simulation results and design concepts are presented.