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Phase reference in phase-sensitive sum-frequency vibrational spectroscopy.

Shumei Sun1, Rongda Liang1, Xiaofan Xu1

  • 1Department of Physics, State Key Laboratory of Surface Physics, and Key Laboratory of Micro- and Nano-Photonic Structures (MOE), Fudan University, Shanghai 200433, China.

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|July 3, 2016
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Summary
This summary is machine-generated.

Transparent crystals like quartz serve as reliable phase references in phase-sensitive sum-frequency vibrational spectroscopy (PS-SFVS), enabling accurate surface characterization. This method refines the understanding of the air/water interface spectrum.

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Area of Science:

  • Surface science
  • Spectroscopy
  • Physical chemistry

Background:

  • Phase-sensitive sum-frequency vibrational spectroscopy (PS-SFVS) is crucial for surface characterization.
  • Accurate phase measurement and a well-defined phase reference are essential for reliable PS-SFVS spectra.
  • Previous studies have shown that incorrect phase measurements can distort spectra, particularly at the air/water interface.

Purpose of the Study:

  • To identify and validate suitable phase references for PS-SFVS.
  • To experimentally and theoretically investigate the use of transparent, nonlinear crystals as phase references.
  • To obtain a reliable OH stretching spectrum for the air/water interface.

Main Methods:

  • Theoretical and experimental investigation of phase-sensitive sum-frequency vibrational spectroscopy (PS-SFVS).
  • Utilizing transparent, highly nonlinear crystals (quartz, barium borate) as phase references.
  • Analyzing the surface properties and spectral contributions (bulk electric dipole, quadrupole) of various materials.

Main Results:

  • Transparent, nonlinear crystals (quartz, barium borate) with clean, unstrained surfaces and proper orientation serve as effective phase references in PS-SFVS.
  • Materials with inversion symmetry (water, fused quartz, CaF2) are poor phase references due to quadrupole contributions and phase dispersion.
  • A reliable OH stretching spectrum for the air/water interface was obtained, with a previously observed positive band in the imaginary component absent.

Conclusions:

  • Transparent nonlinear crystals are suitable phase references for PS-SFVS, enabling accurate surface characterization.
  • The absence of the low-frequency positive band in the air/water interface spectrum suggests it is not due to strongly hydrogen-bonded water species.
  • A residual weak positive feature is likely unrelated to water surface resonance.