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

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.

preprint2013arXivOpen access
D. BuchtaS. R. KrishnanN. B. BrauerM. DrabbelsP. O'KeeffeM. DevettaM. Di FraiaC. CallegariR. RichterM. CorenoK. C. PrinceF. StienkemeierR. MoshammerM. Mudrich
physics.atm-clus
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Open access14 authors1 topic
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D. BuchtaS. R. KrishnanN. B. BrauerM. DrabbelsP. O'KeeffeM. DevettaM. Di FraiaC. CallegariR. RichterM. CorenoK. C. PrinceF. StienkemeierR. MoshammerM. Mudrich

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