期刊
JOURNAL OF CHEMICAL PHYSICS
卷 131, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3180819
关键词
atomic clusters; caesium compounds; mass spectra; molecule-photon collisions; Monte Carlo methods; photoionisation; potassium compounds; rubidium compounds; sodium compounds
资金
- Deutsche Forschungsgemeinschaft
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(+)He(N) when multiply doping the droplets. Fragmentation of clusters Ak(N) upon ionization appears to enhance snowball formation. In the case of Na and Cs we also detect snowballs Ak(2)(+)He(N) 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(+)He(41). 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.
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