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Issue 12, 2015
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Fringes in FTIR spectroscopy revisited: understanding and modelling fringes in infrared spectroscopy of thin films

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Abstract

The appearance of fringes in the infrared spectroscopy of thin films seriously hinders the interpretation of chemical bands because fringes change the relative peak heights of chemical spectral bands. Thus, for the correct interpretation of chemical absorption bands, physical properties need to be separated from chemical characteristics. In the paper at hand we revisit the theory of the scattering of infrared radiation at thin absorbing films. Although, in general, scattering and absorption are connected by a complex refractive index, we show that for the scattering of infrared radiation at thin biological films, fringes and chemical absorbance can in good approximation be treated as additive. We further introduce a model-based pre-processing technique for separating fringes from chemical absorbance by extended multiplicative signal correction (EMSC). The technique is validated by simulated and experimental FTIR spectra. It is further shown that EMSC, as opposed to other suggested filtering methods for the removal of fringes, does not remove information related to chemical absorption.

Graphical abstract: Fringes in FTIR spectroscopy revisited: understanding and modelling fringes in infrared spectroscopy of thin films

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Article information


Submitted
19 Dec 2014
Accepted
07 Apr 2015
First published
07 Apr 2015

Analyst, 2015,140, 3969-3980
Article type
Paper
Author version available

Fringes in FTIR spectroscopy revisited: understanding and modelling fringes in infrared spectroscopy of thin films

T. Konevskikh, A. Ponossov, R. Blümel, R. Lukacs and A. Kohler, Analyst, 2015, 140, 3969
DOI: 10.1039/C4AN02343A

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