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High-resolution ion mobility measurements for silicon cluster anions and cations

J. Chem. Phys. 111, 7865 (1999); doi:10.1063/1.480164

Issue Date: 1 November 1999

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Robert R. Hudgins, Motoharu Imai, and Martin F. Jarrold
Department of Chemistry, Northwestern University, Evanston, Illinois 60208

Philippe Dugourd
Laboratoire de Spectrométrie Ionique et Moléculaire, UMR No. 5579, CNRS et Université Lyon I, 43 bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France
High-resolution ion mobility measurements have been performed for silicon cluster anions and cations, Si<sub>n</sub><sup>-</sup> and Si<sub>n</sub><sup>+</sup>, n = 6–55. New isomers have been resolved for every cluster size larger than Si20. The results for the anions and the cations have the same global features. However, changing the charge often causes a shift in the isomer distribution, or causes new isomers to emerge. For example, the transition from prolate geometries to more-spherical ones is shifted to larger cluster sizes for the anions than for the cations. The mobilities of the anions are systematically smaller than those of the cations, presumably because of differences in the exterior electron densities. ©1999 American Institute of Physics.
History: Received 3 June 1999; accepted 11 August 1999
Permalink: http://link.aip.org/link/?JCPSA6/111/7865/1
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KEYWORDS and PACS

Keywords
PACS
  • 51.50.+v
    Physics of gases Electrical properties (ionization, breakdown, electron and ion mobility, etc.)
  • 36.40.Wa
    Studies of special atoms, molecules, and their ions; clusters Atomic and molecular clusters Charged clusters
  • 36.40.Mr
    Studies of special atoms, molecules, and their ions; clusters Atomic and molecular clusters Spectroscopy and geometrical structure of clusters
  • 33.70.Jg
    Molecular properties and interactions with photons Intensities and shapes of molecular spectral lines and bands Line and band widths, shapes, and shifts
  • 33.15.Bh
    Molecular properties and interactions with photons Properties of molecules and molecular ions General molecular conformation and symmetry; stereochemistry
  • YEAR: 1999

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (18)
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