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Gold as a standard phase reference in complex sum frequency generation measurements.

Joam M Marmolejos1, Patrick J Bisson1, Mary Jane Shultz1

  • 1Water and Interface Surface Science Laboratory, Pearson Chemistry Laboratory, Tufts University, Medford, Massachusetts 02155, USA.

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|April 1, 2019
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Summary
This summary is machine-generated.

Sum frequency generation (SFG) spectroscopy measures complex amplitudes for clearer interface analysis. This study verifies Z-cut quartz as a phase standard and determines the phase of gold, improving interface characterization.

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Area of Science:

  • Surface science and spectroscopy
  • Nonlinear optics and condensed matter physics

Background:

  • Complex soft interfaces are prevalent in nature and technology, but probing buried interfaces is challenging.
  • Vibrational spectroscopy, specifically sum frequency generation (SFG), offers molecular specificity for interface analysis.
  • Current SFG methods struggle with weak signals and resonance separation, often measuring intensity instead of complex amplitude.

Purpose of the Study:

  • To address limitations in sum frequency generation (SFG) spectroscopy by measuring complex amplitude spectra.
  • To establish a reliable method for determining the phase of interfacial species by using a phase standard.
  • To verify Z-cut quartz as a phase standard and measure the phase of gold (Au) for improved SFG analysis.

Main Methods:

  • Employed sum frequency generation (SFG) spectroscopy, a nonlinear optical technique.
  • Measured the complex amplitude spectrum of the sample relative to a nonresonant material.
  • Verified Z-cut quartz as a phase standard and determined the phase of gold (Au) against this standard.

Main Results:

  • Successfully verified Z-cut quartz as a reliable phase standard for SFG measurements.
  • Determined the standard phase of gold (Au) to be -222° under specific excitation (532 nm) and polarization (ppp) conditions.
  • Demonstrated a method to remove ambiguity in complex spectral components by using a phase standard.

Conclusions:

  • Measuring complex amplitudes in SFG spectroscopy enhances the analysis of interfacial molecular species.
  • The verified Z-cut quartz phase standard and determined gold phase provide crucial references for future SFG studies.
  • This work advances the capability of SFG spectroscopy for detailed molecular-level characterization of complex interfaces.