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Related Concept Videos

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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Updated: Jun 11, 2025

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Combining Infrared Refraction and Attenuated Total Reflection Spectroscopy.

Thomas G Mayerhöfer1,2, William D P Costa3, Jürgen Popp1,2

  • 1Spectroscopy and Imaging, Leibniz Institute of Photonic Technology (IPHT), Jena, Germany.

Applied Spectroscopy
|October 7, 2024
PubMed
Summary
This summary is machine-generated.

A novel ZnSe prism enables simultaneous subcritical and attenuated total reflection (ATR) spectroscopy without optical changes. This allows for accurate determination of complex refractive index for materials like benzyl benzoate.

Keywords:
ATR-IRAttenuated total reflection infraredKramers–Kronigcomplex refractive indexinfrared refraction spectroscopy

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Area of Science:

  • Spectroscopy
  • Optical Physics
  • Materials Science

Background:

  • Attenuated Total Reflection (ATR) spectroscopy is a powerful surface-sensitive technique.
  • Conventional ATR setups often require changing optics or samples to measure spectra below and above the critical angle.
  • Accurate determination of the complex refractive index (n∞) is crucial for ATR analysis.

Purpose of the Study:

  • To develop and validate a versatile ZnSe prism for simultaneous subcritical and ATR measurements.
  • To demonstrate the prism's capability in determining the complex refractive index of a sample.
  • To eliminate the need for optical reconfiguration during spectral acquisition.

Main Methods:

  • Fabrication of a ZnSe prism with a 30° face angle.
  • Acquisition of internal reflection spectra (subcritical and ATR) of benzyl benzoate across a range of incidence angles (30°–48°) and polarizations (s- and p-).
  • Analysis of subcritical spectra to determine n∞ and subsequent correction and analysis of ATR spectra.

Main Results:

  • The novel prism successfully recorded both subcritical and ATR spectra without optical adjustments.
  • Subcritical spectra yielded accurate n∞ values for benzyl benzoate.
  • The complex refractive index determined using the corrected ATR spectra showed excellent agreement with ATR spectroscopic ellipsometry.

Conclusions:

  • The developed ZnSe prism offers a streamlined and efficient method for spectroscopic analysis.
  • This versatile optical component simplifies ATR measurements and enhances accuracy.
  • The findings provide a valuable tool for material characterization in various scientific disciplines.