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Extreme ultraviolet 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 Extreme ultraviolet radiation is studied using Velocity-Map Imaging PhotoElectron-PhotoIon COincidence spectroscopy. We present photoelectron energy spectra and angular distributions measured in coincidence with the most abundant ions He(...

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Bibliographic Details
Published in:The Journal of chemical physics 2013-08, Vol.139 (8), p.084301-084301
Main Authors: Buchta, D, Krishnan, S R, Brauer, N B, Drabbels, M, O'Keeffe, P, Devetta, M, Di Fraia, M, Callegari, C, Richter, R, Coreno, M, Prince, K C, Stienkemeier, F, Ullrich, J, Moshammer, R, Mudrich, M
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Language:English
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Summary:The ionization dynamics of pure He nanodroplets irradiated by Extreme ultraviolet radiation is studied using Velocity-Map Imaging PhotoElectron-PhotoIon COincidence 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 observe inelastic collisions of photoelectrons with the surrounding He atoms in the droplets.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4818531