Infrared Refraction Spectroscopy

Mayerhoefer TG, Ivanovski V, Popp J (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Applied Spectroscopy Optical Society of America / Society for Applied Spectroscopy

Book Volume: 75

Pages Range: 1526-1531

Journal Issue: 12

DOI: 10.1177/00037028211036761

Abstract

We suggest a new modality of infrared spectroscopy termed Infrared Refraction Spectroscopy, which is complimentary to absorption spectroscopy. The beauty of this new modality lies not only in its simplicity but also in the fact that it closes an important gap: It allows to quantitatively interpret reflectance spectra by simplest means. First, the refractive index spectrum is calculated from reflectance by neglecting absorption. The change of the refractive index is proportional to concentration, and the spectra with features similar to second derivative absorbance spectra can simply be computed by numerically deriving the refractive index spectra, something which can be easily carried out by standard spectra software packages. The peak values of the derived spectra indicate oscillator positions and are approximately proportional to the concentration in a similar way as absorbance is. In contrast to absorbance spectra, there are no baseline ambiguities for first derivative refractive index spectra, and in refractive index spectra, instead of integrating over a band area, a simple difference of two refractive index values before and after an absorption leads to a quantity that correlates perfectly linearly with concentration in the absence of local field effects.

Involved external institutions

Leibniz-Institut für Photonische Technologien e.V. DE Germany (DE) Saints Cyril and Methodius University of Skopje / Универзитет „Св. Кирил и Методиј“ во Скопје MK Republic of North Macedonia (MK)

How to cite

APA:

Mayerhoefer, T.G., Ivanovski, V., & Popp, J. (2021). Infrared Refraction Spectroscopy. Applied Spectroscopy, 75(12), 1526-1531. https://doi.org/10.1177/00037028211036761

MLA:

Mayerhoefer, Thomas G., Vladimir Ivanovski, and Juergen Popp. "Infrared Refraction Spectroscopy." Applied Spectroscopy 75.12 (2021): 1526-1531.

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