Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 19: Cluster I (joint session A/MO)

A 19.3: Vortrag

Mittwoch, 13. März 2019, 15:00–15:15, S HS 3 Physik

Auger Emission from the Coulomb Explosion of Helium Nanoplasmas — •Michael Zabel, Michael Kelbg, Bennet Krebs, Josef Tiggesbäümker, and Karl-Heinz Meiwes-Broer — Universität Rostock, Institut für Physik, Albert-Einstein-Strasse 23-24, 18059 Rostock

The long-time correlated decay dynamics of strong-field exposed helium nanodroplets is studied by means of angular resolved electron spectroscopy. As a result of the adiabatic expansion of the fully innerionized plasma, delocalized electrons in the laser-produced deep confining mean field potential are shifted towards the vacuum level, whereas some electrons may localize in bound levels of the helium ion. The simple hydrogen-like electronic structure of He⁺ results in clear signatures in the experimental electron spectra. The pronounced features in the electron yields can be traced back to bound-free and bound-bound transitions in He⁺. Auger electron emission takes place as a result of the transfer of the excess energy to weakly bound electrons in the quasifree electron band. Hence, the spacial and temporal development of the nanoplasma cloud is encoded in the experimental spectra, whereas the special electronic properties of helium helps to clearly resolve the different contributions.