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Related Experiment Videos

Absolute surface coverage measurement using a vibrational overtone.

Andrew C R Pipino1, Johan P M Hoefnagels, Noboru Watanabe

  • 1Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA. andrew.pipino@nist.gov

The Journal of Chemical Physics
|July 23, 2004
PubMed
Summary

Evanescent-wave cavity ring-down spectroscopy (EW-CRDS) achieves sub-monolayer surface coverage determination. This method offers high sensitivity for environmental sensing applications.

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Area of Science:

  • Spectroscopy
  • Surface Science
  • Environmental Monitoring

Background:

  • Accurate surface coverage determination is crucial for catalysis and environmental monitoring.
  • Existing techniques may lack sub-monolayer sensitivity or require complex calibration.
  • Cavity Ring-Down Spectroscopy (CRDS) offers high sensitivity for gas-phase analysis.

Purpose of the Study:

  • To demonstrate absolute surface coverage determination with sub-monolayer sensitivity using EW-CRDS.
  • To compare EW-CRDS performance with conventional CRDS and other surface-uptake techniques.
  • To assess the potential of EW-CRDS for environmental sensing of volatile organic compounds.

Main Methods:

  • Utilized evanescent-wave cavity ring-down spectroscopy (EW-CRDS) and conventional CRDS.

Related Experiment Videos

  • Probed C-H stretching overtones of chlorinated ethylenes using a seeded optical parametric amplifier.
  • Employed conservation of absolute integrated absorption intensity for gas and adsorbed phases.

    • Main Results:

    • Achieved sub-monolayer sensitivity in absolute surface coverage determination.
    • Obtained polarized absolute adsorbate spectra using a fused-silica monolithic folded resonator.
    • Derived average transition moment orientation from polarization anisotropy for coverage measurement.
    • Compared EW-CRDS measurements with mass spectrometry and optical waveguide techniques.

    Conclusions:

    • EW-CRDS provides a sensitive method for absolute surface coverage determination.
    • The technique shows promise for environmental sensing applications, particularly for volatile organic compounds like TCE.
    • Direct comparison with other methods validates the accuracy and potential of EW-CRDS.