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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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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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Related Experiment Video

Updated: Oct 21, 2025

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Exploiting spatio-spectral aberrations for rapid synchrotron infrared imaging.

Vijayakumar Anand1, Soon Hock Ng1, Tomas Katkus1

  • 1Optical Sciences Center, Swinburne University of Technology, John Street, Melbourne, Victoria 3122, Australia.

Journal of Synchrotron Radiation
|September 3, 2021
PubMed
Summary

Researchers investigated using a larger infrared beam and computational optics to overcome slow, point-by-point mapping. This approach exploits spatio-spectral aberrations for rapid imaging, enhancing Fourier transform infrared (FTIR) microspectroscopy efficiency.

Keywords:
Infrared Microspectroscopy Beamlinechromatic aberrationscorrelation opticshyperspectral imagingsynchrotron

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Area of Science:

  • Spectroscopy
  • Optical Physics
  • Materials Science

Background:

  • The Australian Synchrotron's Infrared Microspectroscopy Beamline utilizes a Fourier transform infrared (FTIR) spectrometer with mercury cadmium telluride (MCT) and focal plane array (FPA) detectors.
  • Conventional synchrotron infrared (IR) microspectroscopy relies on time-consuming, point-by-point mapping using a tightly focused beam and MCT detector.

Purpose of the Study:

  • To investigate methods for accelerating imaging acquisition in synchrotron IR microspectroscopy.
  • To assess the potential of exploiting spatio-spectral aberrations for rapid imaging.
  • To evaluate a computational optical approach for enhanced imaging speed.

Main Methods:

  • Increased the infrared beam size at the sample plane using a 15× objective.
  • Investigated spatio-spectral aberrations resulting from the larger beam.
  • Applied a correlation-based semi-synthetic computational optical approach.

Main Results:

  • Demonstrated that spatio-spectral aberrations can be characterized and potentially utilized.
  • Showcased the feasibility of a computational approach to interpret data from a larger beam.
  • Identified a pathway towards rapid imaging, moving beyond traditional mapping.

Conclusions:

  • Exploiting spatio-spectral aberrations offers a promising route to significantly increase imaging speed in FTIR microspectroscopy.
  • Computational optical methods can compensate for and leverage optical aberrations for advanced imaging techniques.
  • This study paves the way for faster, more efficient chemical mapping with synchrotron IR radiation.