EUV ionization of pure He nanodroplets: Mass-correlated photoelectron imaging, Penning ionization and electron energy-loss spectra

Abstract

The ionization dynamics of pure He nanodroplets irradiated by EUV radiation is studied using Velocity-Map Imaging PhotoElectron-PhotoIon COincidence (VMI-PEPICO) spectroscopy. We present photoelectron energy spectra and angular distributions measured in coincidence with the most abundant ions He+, He2+, and He3+. Surprisingly, below the autoionization threshold of He droplets we find indications for multiple excitation and subsequent ionization of the droplets by a Penning-like process. At high photon energies we evidence inelastic collisions of photoelectrons with the surrounding He atoms in the droplets.

References in corpus (4)

• Spectroscopy and dynamics in helium nanodroplets
• Penning ionization of doped helium nanodroplets following EUV excitation
• Single photon double ionization of the helium dimer
• Observation of Crossover from Ballistic to Diffusion Regime for Excimer Molecules in Superfluid ${}^4$He

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