Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 117, Issue 21, Pages 4394-4403Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp401424w
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Funding
- Deutsche Forschungsgemeinschaft
- Swiss National Science Foundation [200020_140396]
- Italian National Research Council (CNR) [MD.P03.026.001]
- Swiss National Science Foundation (SNF) [200020_140396] Funding Source: Swiss National Science Foundation (SNF)
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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.
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