Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Cluster II (joint session A/MO)
A 21.4: Poster
Mittwoch, 13. März 2019, 16:15–18:15, S Fobau Physik
Correlation method for velocity map imaging of electrons and time- of-flight detection of ions emitted by individual mid-IR induced helium nanoplasmas. — •Cristian Medina1, Dominik Schomas1, Marcel Mudrich3, Marcus Debatin1, Frank Stienkemeier1, Robert Moshammer2, and Thomas Pfeifer2 — 1Albert-Ludwigs- University of Freiburg, Freiburg im Breisgau, Germany — 2Max plank Institute for nuclear physics, HEIDELBERG, GERMANY — 3Aarhaus University, Aarhus, Denmark
Velocity map imaging (VMI) and time-of-flight (TOF) are standard techniques to probe the photodynamics of molecules and clusters. Using a combined VMI-TOF setup, we study nanoplasmas created from doped helium nanodroplets irradiated with intense mid-infrared femtosecond laser pulses. Quasi-free electrons created by tunnel ionization couple very efficiently to the laser field, thereby acquiring high energy and resulting in an avalanche of impact ionization. The large number of charged particles emitted from a single helium nanoplasma allows us to collect both full electron energy distributions (VMI) and ion mass-over-charge distributions (TOF) from a single hit. Our technique relies on linking the camera used for VMI to the oscilloscope that measures TOF spectra. We discuss the impact of doping the He nanodroplets with various species (Xe, Ca and H2O) to trigger the nanoplasma formation.