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Mass Spectrometry: Alkyl Halide Fragmentation01:22

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Spatial Separation of Molecular Conformers and Clusters
10:37

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Published on: January 9, 2014

Argon clusters embedded in helium nanodroplets.

Filipe Ferreira da Silva1, Peter Bartl, Stephan Denifl

  • 1Institut für Ionenphysik und Angewandte Physik, Leopold Franzens Universität, Technikerstr. 25, A-6020 Innsbruck, Austria.

Physical Chemistry Chemical Physics : PCCP
|October 24, 2009
PubMed
Summary
This summary is machine-generated.

Investigating argon clusters in helium droplets revealed unique ion abundance patterns. Impurities like water and oxygen showed unexpected stability in specific argon cluster sizes, suggesting novel structural properties.

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Area of Science:

  • Atomic and Molecular Physics
  • Cluster Science
  • Physical Chemistry

Background:

  • Helium droplets provide a unique matrix for studying cluster properties.
  • Electron impact ionization is a common technique for probing cluster structures.
  • Understanding cluster ion formation and stability is crucial in various scientific fields.

Purpose of the Study:

  • To investigate the electron impact ionization of argon clusters within helium droplets.
  • To analyze the mass spectra and determine the abundance distributions of argon cluster ions.
  • To explore the influence of impurities on argon cluster ion stability and structure.

Main Methods:

  • High-resolution mass spectrometry was employed to analyze ionized argon clusters.
  • Argon clusters were embedded in helium droplets for controlled investigation.
  • Electron impact ionization was used to generate cluster ions.

Main Results:

  • Superior mass resolution allowed differentiation of isobaric cluster ions, confirming an abundance maximum for ArHe(12)(+).
  • Formation of Ar(2)He(n)(+) complexes was observed, contrary to previous fragmentation claims.
  • Argon cluster ions with water, nitrogen, or oxygen impurities exhibited anomalous abundance peaks at specific sizes (e.g., Ar(55)H(2)O(+), Ar(54)O(2)(+), Ar(54)N(2)(+)).

Conclusions:

  • The helium matrix does not fully suppress fragmentation of argon cluster ions.
  • Anomalous abundance peaks for impurity-containing clusters suggest enhanced stability, potentially linked to the closure of the second icosahedral shell.
  • Differences in magic numbers and reactivity indicate distinct structural properties for impurity-bound argon clusters.