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

Buchta, D.; Krishnan, Siva Rama; Brauer, N. B.; Drabbels, M.; O’Keeffe, P.; Devetta, M.; Fraia, M. Di; Callegari, C.; Richter, R.; Coreno, M.; Prince, K. C.; Stienkemeier, F.; Ullrich, J.; Moshammer, R.; Mudrich, M.

doi:10.1063/1.4818531

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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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引用

Buchta, D., Krishnan, S. R., Brauer, N. B., Drabbels, M., O’Keeffe, P., Devetta, M., Fraia, M. D., Callegari, C., Richter, R., Coreno, M., Prince, K. C., Stienkemeier, F., Ullrich, J., Moshammer, R., & Mudrich, M. (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):. doi:10.1063/1.4818531.

引用: https://hdl.handle.net/11858/00-001M-0000-0014-6522-F

要旨

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.