Hannover 2020 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 5: MO Poster 1
MO 5.16: Poster
Montag, 9. März 2020, 17:00–19:00, Empore Lichthof
Electron imaging of noble gases clusters under MIR laserfields — •Cristian Medina1, Dominik Schomas1, Markus Debatin1, Ltaif Ltaif2, Robert Moshammer3, Thomas Pfeifer3, Frank Stienkemeier1, and Marcel Mudrich2 — 1Albert-Ludwigs-Universität, Freiburg — 2Aarhus University, Aarhus — 3Max-Planck-Institut für Kernphysik, Heidelberg
In this project, we studied the behavior of the nanoplasma explosion of helium (He) and neon (Ne) droplets exposed to a strong and short mid-infrared laser field. The nanoplasma is initiated by strong-field ionization of the cluster or dopant atoms, creating an impact-ionization avalanche in the cluster and ending in a Coulomb explosion of the nanoplasma. Clusters provide a large variety of additional effects compared to strong-field ionization in single atoms, such as enhanced ionization due to electron impact ionization, or collective oscillations of quasi-free electrons. He droplets are particularly interesting, due to their extremely high ionization potential. Additionally, they offer unique doping properties, which allows us to investigate the effect of the dopant species and to design an optimal doping system to ignite the process. The large number of charged particles emitted from a single nanoplasma explosion allows us to collect both full electron energy distributions (VMI) and ion mass-over-charge distributions (TOF) from a single hit. We can measure correlated single shot-single hit spectra and we can assign features in the photoelectron spectra to certain charge states of the cluster. We discuss the impact of doping with various species (Xe and Ca) to trigger the nanoplasma formation.