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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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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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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Sub-Second, Sensitive and Multispecies Detection of Volatile Organic Compounds Using a Mid-Infrared Broadband

Yueyu Lin1, Paola Formica1,2, Roderik Krebbers1

  • 1Trace Detection Laboratory, Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands.

Applied Spectroscopy
|May 4, 2026
PubMed
Summary
This summary is machine-generated.

This study presents a new system for fast and sensitive detection of volatile organic compounds (VOCs). The technology enables accurate identification and real-time monitoring of multiple VOC species, crucial for environmental and health applications.

Keywords:
MIR supercontinuum sourceVOCsVolatile organic compoundsmid-infraredmultispecies gas detectionupconversion spectroscopy

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Environmental Science

Background:

  • Volatile organic compounds (VOCs) monitoring is essential for environmental safety and human health.
  • Existing methods for VOC detection can lack speed, sensitivity, or multi-species capability.

Purpose of the Study:

  • To develop and evaluate a novel system for fast, sensitive, and multi-species detection of VOCs.
  • To demonstrate the system's ability to identify individual compounds and analyze dynamic multicomponent mixtures.

Main Methods:

  • Integration of a fiber-based broadband mid-infrared (MIR) supercontinuum (SC) source with an upconversion spectrometer.
  • Evaluation using acetone, ethanol, and α-pinene, monitoring their evaporation dynamics and mixture behavior.

Main Results:

  • Achieved detection limits of 30 ppm·m for acetone, 5 ppm·m for ethanol, and 0.6 ppm·m for α-pinene within 1 second.
  • Demonstrated high species identification accuracy and robustness against inter-species interference.
  • Successfully investigated individual compound evaporation from a mixture, showcasing dynamic multicomponent analysis.

Conclusions:

  • The developed system offers a significant advancement in VOC detection technology.
  • The system provides a powerful tool for real-time environmental monitoring and health-related analyses.
  • This approach enables detailed investigation of complex VOC mixture dynamics.