Erlangen 2018 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 14: Atomic Clusters III (joint session A/MO)

MO 14.3: Vortrag

Mittwoch, 7. März 2018, 14:30–14:45, K 2.016

Size Dependent Ion Yields from NaCl Nanoarticles Ionized by Intense Femtosecond Laser Pulses — •Egill Antonsson, Felix Gerke, Lucia Merkel, Ina Halfpap, Burkhard Langer, and Eckart Rühl — Physical Chemistry, Freie Universität Berlin, D-14195 Berlin, Germany

Ionization of size selected nanoparticles by intense femtosecond laser pulses is studied by time-of-flight mass spectrometry. For NaCl nanoparticles (d=100-600 nm), a size dependent modulation in the ratio of the yields of Na⁺ and Cl⁺ ions is observed, although the stoichiometry of the nanoparticles is constant irrespective of size. The observed size dependent ion yields are interpreted in terms of a model, where the intense laser pulses create a nanoplasma and the ion yields of the constituent elemental ions in the nanoparticles are determined by the plasma temperature and the ionization potentials of the elements.