Ejection of cluster ions as a result of electron impact ionization of argon clusters

A. V. Malakhovskii

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Abstract

Time evolution of mass distribution of argon cluster ions has been studied in pulsed jets (pulse duration ≈ 0.4 ms) by retarding potential method. The ejection of cluster ions of the order of 180 atoms from cluster ions of the order of 500 atoms has been revealed. The ejection has a threshold character as a function of the time elapsed after electron impact ionization. The threshold time was about 20 μs. Delayed non-thermal fragmentation of the cluster ions testifies that the self-trapped ion, formed in argon clusters as a result of ionization, can live for a long time in its excited state without dissipation of the excess energy to the cluster. This ion should be located on the surface of the cluster. Energetic analysis of the fragmentation is consistent with the size of the ejected clusters. A model of the observed time evolution of the delayed fragmentation is herein proposed.

Original languageEnglish
Pages (from-to)471-481
Number of pages11
JournalChemical Physics
Volume270
Issue number3
DOIs
StatePublished - 15 Aug 2001

Bibliographical note

Funding Information:
The author is grateful to Prof. A. Gedanken for support and to the Israel Ministry of Absorption for a KAMEA scholarship. Special thanks to Dr. Shifra Hochberg for editorial assistance.

Keywords

  • Clusters
  • Noble gases

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