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Challenges in Interpreting Vibrational Sum Frequency Spectra: Deconvoluting Spectral Features as Demonstrated in the Calcium Fluoride-Water-Sodium Dodecylsulfate System

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Abstract:

Vibrational sum frequency spectroscopy is used to examine the CaF2/H2O interface and the CaF2/D2O interface upon adsorption of the anionic surfactant sodium dodecylsulfate (SDS) onto the CaF2 surface. Proper interpretation of the results from this coherent spectroscopic technique requires a meticulous understanding of the interferences that result between sharp CH stretching modes, broad OH stretching modes, and the nonresonant background. The reported studies demonstrate the appropriate spectral analysis procedure required for a correct interpretation of spectra of this type and the errors that can result from a more simplistic but commonly used analysis procedure.

Keywords: DECONVOLUTION; INDEX HEADINGS VIBRATIONAL SUM FREQUENCY SPECTROSCOPY; SOLID LIQUID INTERFACE; SPECTRAL; SPECTRAL BAND INTERFERENCES; SURFACTANT ADSORPTION; VSFS

Document Type: Miscellaneous

DOI: http://dx.doi.org/10.1366/000370202321116048

Publication date: December 1, 2002

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