Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 25: Poster Session I
A 25.18: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
Correlation method for velocity map imaging and time of flight techniques for electrons and ions in helium nanodroplets. — •cristian medina1, dominik schomas1, nicolas rendler1, robert moshammer2, thomas pfeifer2, and marcel mudrich3 — 1Albert Ludwigs University of Freiburg, Freiburg, Germany — 2Max Planck Institute for Nuclear Physics, Heidelberg, Germany — 3Aarhus University, Aarhus, Denmark
Velocity map imaging (VMI) and time of flight (TOF) are techniques that have been used separately to study molecules and clusters. Using a combined VMI-TOF setup, doped helium nanodroplets are irradiated by near-infrared femtosecond laser pulses creating a nanoplasma state by strong-field ionization. The occurring electrons couple very efficiently to the laser field and acquire high energy, resulting in an avalanche of impact ionizations. The large number of charged particles allows us to collect complete spectra for both, VMI and TOF, from a single hit. We present a computational method for the data acquisition and correlation in real time for the VMI-TOF experiment by linking the CCD-camera from the VMI to a data acquisition card of the TOF. This allows us to identify a single event in each technique making possible to link each other and study the complete spectra for a single nanoplasma. The program runs on the LabVIEW real-time platform in a rate of 3µs per loop and includes identification of events that analyses and save only single events data discarding non relevant information.