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Erlangen 2022 – scientific programme

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MO: Fachverband Molekülphysik

MO 19: Poster 3

MO 19.17: Poster

Thursday, March 17, 2022, 16:30–18:30, P

Towards nanoplasma formation from size selected helium droplets using an electrostatic deflectorCristian Medina1, •Sebastian Trippel2, Robert Moshammer3, Thomas Pfeifer3, Jochen Kupper2, Frank Stienkemeier1, and Marcel Mudrich411University of Freiburg, Freiburg im Breisgau, Germany — 2Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 3Max Planck Institute for Nuclear Physics, Heidelberg, Germany — 4Aarhus University, Aarhus, Denmark

It has recently been demonstrated that passing a molecule with a large dipole moment embedded inside a helium nanodroplet across an inhomogeneous electric field allows deflecting the entire droplet depending on its mass [1]. We present the calculations and design for a helium droplet size selector apparatus using CsI molecules as dopants. The doped clusters are deflected transversally by a type-B deflector with an inhomogeneous electric field [2]. In the proposed experiment, a nanoplasma is ignited in the helium droplet by a NIR femtosecond laser, tightly focused by a motorized back-focusing mirror, moving the focus across the diverted beam. The resulting electrons and ions emitted by the nanoplasma are collected by an electron velocity-map imaging and an ion time-of-flight spectrometer. The theoretical calculations of the spatial deflections were done using the CMIfly software developed by the Molecule Imaging group (CMI) at the Centre for Free-Electron Laser Science (CFEL)[2].

[1]D.J. Merthe et al., j. phys. chem. lett. 7 (2016).

[2]J-P. Chang et al., comput. phys. commun. 185 (2014).

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