Imaging with Ion Beams and Laser Postionization

M. Wood, Y. Zhou, C. L. Brummel, Nicholas Winograd

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We investigate the use of a liquid metal ion gun (LMIG) combined with multiphoton resonance ionization of sputtered atoms and/or molecules to acquire mass-selected images with submicrometer spatial resolution. Images from several model systems are presented including those of an In grid, and of patterned surfaces of benzo[a]pyrene and tryptophan thin films. Since postionization for these systems yields ionization efficiencies that are considerably higher than those achieved with secondary ion mass spectrometry (SIMS), spatial resolution of 2600 Å for molecular species could be achieved while static conditions were maintained. Cooling of the sample to <210 K was shown to be essential for molecular systems since the number of thermally evaporating molecules overwhelms the number of sputtered molecules at room temperature. Other details necessary to incorporate laser postionization into a time-of-flight SIMS instrument using a pulsed LMIG source are also discussed.

Original languageEnglish (US)
Pages (from-to)2425-2432
Number of pages8
JournalAnalytical Chemistry
Volume66
Issue number15
DOIs
StatePublished - Aug 1 1994

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Ion beams
Ion sources
Secondary ion mass spectrometry
Liquid metals
Imaging techniques
Molecules
Ionization
Metal ions
Lasers
Benzo(a)pyrene
Tryptophan
Cooling
Thin films
Atoms
Temperature

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Cite this

Wood, M. ; Zhou, Y. ; Brummel, C. L. ; Winograd, Nicholas. / Imaging with Ion Beams and Laser Postionization. In: Analytical Chemistry. 1994 ; Vol. 66, No. 15. pp. 2425-2432.
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Imaging with Ion Beams and Laser Postionization. / Wood, M.; Zhou, Y.; Brummel, C. L.; Winograd, Nicholas.

In: Analytical Chemistry, Vol. 66, No. 15, 01.08.1994, p. 2425-2432.

Research output: Contribution to journalArticle

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