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Capture of lithium by 4He clusters: Surface adsorption, Penning ionization, and formation of HeLi+

J. Chem. Phys. 107, 2839 (1997); doi:10.1063/1.474642

Issue Date: 22 August 1997

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Adi A. Scheidemann
University of Washington, Department of Chemistry, Seattle, Washington 98125

Vitaly V. Kresin
University of Southern California, Department of Physics and Astronomy, Los Angeles, California 90089-0484

Henry Hess
University of Washington, Department of Chemistry, Seattle, Washington 98125
We investigate the capture of lithium atoms by a beam of large cold helium clusters and subsequent ion production by electron impact. Li atoms are efficiently picked up by the He droplets, although with a cross section significantly lower than that for other atoms and molecules. The mass spectrum reveals the presence of Li atom and dimer ions, as well as the weakly bound complex HeLi+, confirming that capture by He-cluster beams can be used for efficient soft ionization of fragile species. The electron-energy dependence of the Li+, Li<sub>2</sub><sup> + </sup>, and HeLi+ yield shows that they are formed primarily by Penning ionization in a collision with a metastable He atom in the droplet. This leads to the conclusion that lithium metal atoms are not submerged in the helium clusters but locate on the surface, corroborating theoretical predictions for bulk helium surfaces and spectroscopic measurements. ©1997 American Institute of Physics.
History: Received 3 March 1997; accepted 21 May 1997
Permalink: http://link.aip.org/link/?JCPSA6/107/2839/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.30.Cf
    Physical Chemistry Specific chemical reactions; reaction mechanisms Atom and radical reactions; chain reactions
  • 34.50.Fa
    Atomic and molecular collision processes and interactions Scattering of atoms, molecules, and ions Electronic excitation and ionization of atoms (including beamfoil excitation and ionization)
  • 34.80.Gs
    Atomic and molecular collision processes and interactions Electron scattering Molecular excitation and ionization by electron impact
  • 36.40.Jn
    Studies of special atoms, molecules, and their ions; clusters Atomic and molecular clusters Reactivity of clusters
  • 31.50.+w
    Electronic structure of atoms, molecules and their ions: theory Excited states
  • YEAR: 1996-97

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (32)
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