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Marcel Mudrich

Alkali-helium snowball complexes formed on helium nanodroplets

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  • S. Müller, Albert-Ludwigs-Universität Freiburg
  • ,
  • M. Mudrich
  • F. Stienkemeier, Albert-Ludwigs-Universität Freiburg

We systematically investigate the formation and stability of snowballs formed by femtosecond photoionization of small alkali clusters bound to helium nanodroplets. For all studied alkali species Ak= (Na,K,Rb,Cs) we observe the formation of snowballs Ak+ HeN when multiply doping the droplets. Fragmentation of clusters AkN upon ionization appears to enhance snowball formation. In the case of Na and Cs we also detect snowballs Ak 2 + HeN formed around Ak dimer ions. While the snowball progression for Na and K is limited to less than 11 helium atoms, the heavier atoms Rb and Cs feature wide distributions at least up to Ak+ He41. Characteristic steps in the mass spectra of Cs-doped helium droplets are found at positions consistent with predictions on the closure of the first shell of helium atoms around the Ak+ ion based on variational Monte Carlo simulations.

TidsskriftJournal of Chemical Physics
StatusUdgivet - 2009
Eksternt udgivetJa

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