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Journal Article

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

MPS-Authors
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Krishnan,  Siva Rama
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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Ullrich,  J.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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Moshammer,  R.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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http://jcp.aip.org/resource/1/jcpsa6/v139/i8/p084301_s1
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Citation

Buchta, D., Krishnan, S. R., Brauer, N. B., Drabbels, M., O’Keeffe, P., Devetta, M., et al. (2013). Extreme ultraviolet ionization of pure He nanodroplets: Mass-correlated photoelectron imaging, Penning ionization, and electron energy-loss spectra. Journal of Chemical Physics, 139(8): 084301. doi:10.1063/1.4818531.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0014-6522-F
Abstract
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+, He 2+, and He 3+. 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.