Interference effects in the sum frequency generation spectra of thin organic films. II: Applications to different thin-film systems

The Journal of Chemical Physics
Yujin TongShen Ye

Abstract

In this paper, the results of the modeling calculations carried out for predicting the interference effects expected in the sum frequency generation (SFG) spectra of a specific thin-layer system, described in the accompanying paper, are tested by comparing them with the experimental spectra obtained for a real thin-layer film comprising an organic monolayer/variable thickness dielectric layer/gold substrate. In this system, two contributions to the SFG spectra arise, a resonant contribution from the organic film and a nonresonant contribution from the gold substrate. The modeling calculations are in excellent agreement with the experimental spectra over a wide range of thicknesses and for different polarization combinations. The introduction of another resonant monolayer adjacent to the gold substrate and with the molecules having a reverse orientation has a significant affect on the spectral shapes which is predicted. If a dielectric substrate such as CaF(2) is used instead of a gold substrate, only the spectral intensities vary with the film thickness but not the spectral shapes. The counterpropagating beam geometry will change both the thickness dependent spectral shapes and the intensity of different vibrational modes in co...Continue Reading

References

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Citations

Aug 30, 2014·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Shen YePaul B Davies
Oct 6, 2018·Physical Chemistry Chemical Physics : PCCP·Martin ThämerMartin Wolf
Jun 19, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Michael T L Casford, Paul B Davies
Sep 26, 2020·Analytical Chemistry·Bolin LiZhan Chen
May 21, 2013·The Journal of Physical Chemistry. B·Peter J N KettPaul B Davies

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Methods Mentioned

BETA
x-ray diffraction

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