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Large-volume, coolable spectroscopic cell for aerosol studies.

R A McPheat1, D A Newnham, R G Williams

  • 1Department of Space Science and Technology, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK.

Applied Optics
|March 28, 2008
PubMed
Summary

A new spectroscopic cell allows detailed study of aerosol particles, measuring properties like freezing temperatures and chemical composition. This research aids atmospheric chemistry and pollution analysis.

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Area of Science:

  • Atmospheric Chemistry
  • Spectroscopy
  • Aerosol Science

Background:

  • Atmospheric aerosols significantly impact climate and air quality.
  • Accurate characterization of aerosol physical and chemical properties is crucial for atmospheric models.
  • Existing methods may have limitations in aerosol residence time and interaction with cell walls.

Purpose of the Study:

  • To develop and present a novel coolable spectroscopic cell for in-situ characterization of simulated atmospheric aerosols.
  • To enable precise measurements of aerosol optical properties, phase transitions, and chemical composition.
  • To facilitate extended aerosol residence times, minimizing wall-aerosol interactions.

Main Methods:

  • Construction of a large-volume (0.075 m(3)) coolable spectroscopic cell.
  • Optical interfacing with Fourier-transform spectrometers for broadband spectral analysis (IR, Vis, UV).
  • Operation over a wide temperature range (180-300 K) to study phase transitions and properties.

Main Results:

  • The cell successfully characterizes refractive indices, freezing temperatures, and chemical composition of various aerosol types.
  • Extended aerosol residence time (>2 h) was achieved, reducing wall effects.
  • Broadband extinction spectra of aerosol particles and gas-phase components were recorded.

Conclusions:

  • The developed spectroscopic cell is a valuable tool for atmospheric aerosol research.
  • Data generated have direct applications in remote sensing and atmospheric modeling.
  • The cell supports studies on heterogeneous atmospheric chemistry and air pollution.