Alkali-helium snowball complexes formed on helium nanodroplets

被引：47

作者：

Mueller, S. ^{[1
]}

Mudrich, M. ^{[1
]}

Stienkemeier, F. ^{[1
]}

机构：

[1] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany

来源：

JOURNAL OF CHEMICAL PHYSICS | 2009年 / 131卷 / 04期

关键词：

atomic clusters; caesium compounds; mass spectra; molecule-photon collisions; Monte Carlo methods; photoionisation; potassium compounds; rubidium compounds; sodium compounds; WAVE-PACKET DYNAMICS; BOSONIC HELIUM; HE-4; DROPLETS; LIQUID-HELIUM; CLUSTERS; ATOMS; IONS; ENERGIES; MICROSOLVATION; SPECTROSCOPY;

D O I：

10.1063/1.3180819

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页数：7

共 36 条

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