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Cluster cations ejected from liquid metal ion source: alkali metals (Li, Na) and group IV elements (Si, Ge, Sn, Pb)

  • Y. Saito
  • T. Noda
Conference paper

Abstract

Cluster abundance of Li+ n (n ≤ 19), Na+ n (n ≤ 25), Si z+ n (n ≤ 8 for z = 1,3 ≤n ≤ 7 for z = 2), Ge z+ n (n≤11 for z=l,3 ≤ n≤9 for z = 2, n = 4 for z = 3), Sn z+ n (n≤7 for z=l, 3 ≤ n ≤ 9 for z = 2, n = 4 for z = 3) and Pb z+ n (n ≤ 6 for z = 1, 5 ≤ n ≤ 7 for z = 2) ejected from a liquid metal ion source has been investigated by mass spectrometry. The abundance spectra of alkali metal clusters showed distinct maxima and steps at n = 3,7,9,13 and 19 for Li, and at n = 3,5,11,13 and 19 for Na. Mass spectra of Si, Ge and Sn clusters were very similar each other, showing intensity drops after n = 4 and 6 (and also n=10 for Ge) for singly charged clusters. The magic numbers observed are discussed in terms of stability of charged clusters.

PACS

36.40 79.70 35.20.X 

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Y. Saito
    • 1
  • T. Noda
    • 2
  1. 1.Department of Applied PhysicsNagoya UniversityNagoyaJapan
  2. 2.Department of Electrical and Electronic EngineeringToyohashi University of TechnologyToyohashi 440Japan

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