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Cavity Attenuated Phase Shift Faraday Rotation Spectroscopy.

Charles Link Patrick1, Jonas Westberg1, Gerard Wysocki1

  • 1Department of Electrical Engineering , Princeton University , Princeton , New Jersey 08544 , United States.

Analytical Chemistry
|December 19, 2018
PubMed
Summary
This summary is machine-generated.

A new spectroscopy technique enhances oxygen detection sensitivity by using a high-finesse cavity and phase-sensitive polarimetry. This method offers high precision for detecting paramagnetic trace gases without spectral interference.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Spectroscopy
  • Environmental Science

Background:

  • Cavity-enhanced spectroscopy techniques are crucial for sensitive trace gas detection.
  • Faraday rotation spectroscopy offers a non-intrusive method for analyzing paramagnetic species.
  • Existing methods often face limitations in sensitivity or susceptibility to spectral interferences.

Purpose of the Study:

  • To develop and demonstrate a novel cavity-attenuated phase shift Faraday rotation spectroscopy system.
  • To achieve ultra-high sensitivity for detecting paramagnetic trace gases.
  • To validate the technique's robustness against spectral interferences.

Main Methods:

  • Implementation of a high-finesse optical cavity.
  • Utilization of phase-sensitive balanced polarimetric detection.
  • Demonstration using oxygen detection near 762 nm.

Main Results:

  • Achieved a minimum detectable polarization rotation angle of 5.6 × 10-9 rad/√Hz.
  • Demonstrated an absorption sensitivity of 4.5 × 10-10 cm-1/√Hz.
  • Confirmed insusceptibility to spectral interferences.

Conclusions:

  • Cavity-attenuated phase shift Faraday rotation spectroscopy provides exceptional sensitivity for trace gas analysis.
  • The technique is highly suitable for detecting paramagnetic molecules like O2, NO, NO2, and radicals.
  • This method offers a promising alternative for environmental monitoring and chemical sensing applications.