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Marcel Mudrich

Charge transfer and penning ionization of dopants in or on helium nanodroplets exposed to EUV radiation

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DOI

  • Dominic Buchta, Albert-Ludwigs-Universität Freiburg
  • ,
  • Siva Rama Krishnan, Max-Planck-Institut für Kernphysik, IBM-India Semiconductor R and D Center
  • ,
  • Nils B. Brauer, École Polytechnique Fédérale de Lausanne
  • ,
  • Marcel Drabbels, École Polytechnique Fédérale de Lausanne
  • ,
  • Patrick O'Keeffe, Consiglio Nazionale delle Ricerche
  • ,
  • Michele Devetta, Universita degli Studi di Milano
  • ,
  • Michele Di Fraia, Universita degli Studi di Trieste
  • ,
  • Carlo Callegari, Elettra-Sincrotrone Trieste S.C.p.A.
  • ,
  • Robert Richter, Elettra-Sincrotrone Trieste S.C.p.A.
  • ,
  • Marcello Coreno, Consiglio Nazionale delle Ricerche
  • ,
  • Kevin C Prince, Elettra-Sincrotrone Trieste S.C.p.A.
  • ,
  • Frank Stienkemeier, Albert-Ludwigs-Universität Freiburg
  • ,
  • Robert Moshammer, Max-Planck-Institut für Kernphysik
  • ,
  • Marcel Mudrich

Helium nanodroplets are widely used as a cold, weakly interacting matrix for spectroscopy of embedded species. In this work, we excite or ionize doped He droplets using synchrotron radiation and study the effect onto the dopant atoms depending on their location inside the droplets (rare gases) or outside at the droplet surface (alkali metals). Using photoelectron-photoion coincidence imaging spectroscopy at variable photon energies (20-25 eV), we compare the rates of charge-transfer to Penning ionization of the dopants in the two cases. The surprising finding is that alkali metals, in contrast to the rare gases, are efficiently Penning ionized upon excitation of the (n = 2)-bands of the host droplets. This indicates rapid migration of the excitation to the droplet surface, followed by relaxation, and eventually energy transfer to the alkali dopants.

OriginalsprogEngelsk
TidsskriftJournal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory
Vol/bind117
Nummer21
Sider (fra-til)4394-4403
Antal sider10
ISSN1089-5639
DOI
StatusUdgivet - 30 maj 2013
Eksternt udgivetJa

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