Secondary ion statistics and determination of nanocluster ( m > 10 7 amu) ion registration efficiency

The m/ q spectra of gold nanocluster ions (NCI) (〈 D〉 = 18.1 nm and 〈 m〉 = 4.6 × 10 7 amu) desorbed from nanodispersed targets with 252Cf fission fragments were measured using a tandem time-of-flight mass spectrometer at acceleration of 38 kV. In parallel, the statistics of secondary ions (SI) emitt...

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Bibliographic Details
Published in:Applied surface science 2006-07, Vol.252 (19), p.7034-7037
Main Authors: Novikov, A.V., Kirillov, S.N., Baranov, I.A., Obnorskii, V.V., Yarmiychuk, S.V.
Format: Article
Language:English
Subjects:
Nanocluster
Registration efficiency
Statistics
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Summary:The m/ q spectra of gold nanocluster ions (NCI) (〈 D〉 = 18.1 nm and 〈 m〉 = 4.6 × 10 7 amu) desorbed from nanodispersed targets with 252Cf fission fragments were measured using a tandem time-of-flight mass spectrometer at acceleration of 38 kV. In parallel, the statistics of secondary ions (SI) emitted with NCI from various converters (Au and CsI) were measured and the registration efficiency (RE) of NCI was determined. It was shown that distribution of SI number is most adequately described by the geometric distribution. The resulting values of RE are less by a factor of 1.5–2 than those predicted by the Poisson distribution for the m/ q range from 3.1 × 10 6 to 8.2 × 10 6 amu/e.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2006.02.268