Removing interference-based effects from the infrared transflectance spectra of thin films on metallic substrates: A fast and wave optics conform solution

in: Analyst (2018)
Mayerhöfer, Thomas G.; Pahlow, Susanne; Hübner, Uwe; Popp, Jürgen
A hybrid formalism combining elements from Kramers-Kronig based analyses and dispersion analysis was developed, which allows correcting artefacts arising from electric field standing wave effects in the infrared spectra of layers on highly reflecting substrates. In order to enable a highly convenient application, the correction procedure is fully automatized and usually requires less than a minute with non-optimized software on a typical office PC. The formalism was tested with both synthetic and experimental spectra of Poly(methyl methacrylate) on gold. The results confirmed the usefulness of the formalism: falsified peak ratios as well as the distorted baseline in the original spectra were successfully corrected. Accordingly, the introduced formalism makes it possible to use inexpensive and robust highly reflecting substrates for routine infrared spectroscopic investigations of organic and biological samples.

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