Optics of surfaces and interfaces

Infra-red spectroscopy of reflection-absorbance with account for thin surface layers: the theoty and experiment

A. V. Michailov^a, A. V. Povolotskiy^a, V. L. Kuz'min<sup>b

a</sup> Saint Petersburg State University, 198504 St. Petersburg, Russia
^b Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia

Abstract: The description of the reflectance-absorbance spectra for the light reflecting from the plane boundary between absorbing liquid phase and the gaseous one is developed accounting a thin anisotropic absorbing interfacial layer. The surface contributions are shown being described in terms of four integral parameters of the permittivity profiles universal respectively of the incidence angle and the type of profile. The results of performed studies of angular dependency of the reflectance-absorbance spectra in the infra red region for the lipid on the water-gas interface are in a fair agreement numerically with the model considered.

Keywords: plane interface boundary, reflectance-absorbance, permittivity.

Received: 03.10.2023
Revised: 20.02.2024
Accepted: 20.02.2024

DOI: 10.61011/OS.2024.02.57779.5620-23

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