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Related Experiment Videos

Imaging with ion beams and laser postionization

M Wood1, Y Zhou, C L Brummel

  • 1Department of Chemistry, Pennsylvania State University, University Park 16802.

Analytical Chemistry
|August 1, 1994
PubMed
Summary

This study demonstrates submicrometer imaging using a liquid metal ion gun (LMIG) with resonance ionization, achieving high spatial resolution for molecular species. Sample cooling is crucial for preserving molecular integrity during analysis.

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Area of Science:

  • Surface science
  • Mass spectrometry
  • Materials characterization

Background:

  • Secondary Ion Mass Spectrometry (SIMS) is a powerful surface analysis technique.
  • Limitations in spatial resolution and ionization efficiency hinder detailed molecular imaging in SIMS.
  • Developing advanced ionization methods is critical for high-resolution molecular surface analysis.

Purpose of the Study:

  • To investigate the combination of a liquid metal ion gun (LMIG) with multiphoton resonance ionization.
  • To achieve mass-selected imaging with submicrometer spatial resolution for molecular species.
  • To evaluate the performance of this technique on model systems and identify optimal operating conditions.

Main Methods:

  • Utilized a liquid metal ion gun (LMIG) for sputtering sample surfaces.

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  • Employed multiphoton resonance ionization for postionization of sputtered atoms and molecules.
  • Acquired mass-selected images using a time-of-flight mass spectrometer.
  • Investigated the effect of sample cooling to < 210 K on molecular signal preservation.

    • Main Results:

    • Achieved submicrometer spatial resolution (down to 2600 Å) for molecular species.
    • Demonstrated high ionization efficiencies, surpassing those of conventional SIMS.
    • Successfully imaged model systems including an In grid and patterned thin films of benzo[a]pyrene and tryptophan.
    • Confirmed the necessity of sample cooling for maintaining molecular signal integrity.

    Conclusions:

    • LMIG combined with resonance ionization is a viable method for high-resolution molecular imaging.
    • This technique offers significant advantages in ionization efficiency and spatial resolution over traditional SIMS.
    • Sample cooling is essential for successful molecular analysis, preventing thermal evaporation.