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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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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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When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
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Highly sensitive trace oxygen sensing based on far-ultraviolet absorption spectroscopy.

Xinyu Ai1, Yungang Zhang2, Zhiguo Zhang1,3

  • 1School of Physics, Harbin Institute of Technology, Harbin 150001, China.

The Analyst
|August 31, 2022
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Summary
This summary is machine-generated.

This study demonstrates highly sensitive trace oxygen sensing using far-ultraviolet absorption spectroscopy. The developed method achieves a low detection limit of 12 ppm, showing promise for nitrogen protection applications.

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Area of Science:

  • Spectroscopy
  • Analytical Chemistry
  • Environmental Monitoring

Background:

  • Accurate trace oxygen detection is crucial for industrial processes and environmental monitoring.
  • Far-ultraviolet (FUV) absorption spectroscopy offers a sensitive method for gas analysis.

Purpose of the Study:

  • To develop and validate a high-sensitivity trace oxygen sensing system using FUV absorption spectroscopy.
  • To determine the optimal parameters for sensitive and accurate oxygen measurement in the FUV range.

Main Methods:

  • Measurement of oxygen absorption spectra in the 170-200 nm range at normal pressure.
  • Error analysis to identify the optimal wavelength range (180-189 nm) for detection.
  • Establishment of a total column (CL) calibration curve and determination of the optical path length (L1).

Main Results:

  • The maximum oxygen absorption peak was observed near 180.18 nm.
  • An optimal wavelength range of 180-189 nm was identified for sensitive measurements.
  • A detection sensitivity of 232 m⁻¹ and a lowest detection limit of 12 ppm were achieved at L1 = 0.75(3) m.

Conclusions:

  • The developed FUV absorption spectroscopy system provides high-sensitivity trace oxygen sensing.
  • The system demonstrates significant potential for applications requiring precise oxygen monitoring, such as nitrogen protection.