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Related Experiment Video

Updated: Apr 28, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

Pulsed quantum cascade laser based hypertemporal real-time headspace measurements.

Toby K Boyson, Dylan R Rittman, Thomas G Spence

|June 13, 2014

Summary

This summary is machine-generated.

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This study advances real-time cavity ringdown spectroscopy for sensitive detection of trace molecules. Rapid, wide-bandwidth measurements enable identification of substances like explosives in their headspace.

Area of Science:

Analytical Chemistry
Spectroscopy
Chemical Sensing

Background:

Optical cavity enhancement is crucial for sensitive spectroscopic measurements.
Detecting trace levels of unknown substances like explosives requires advanced techniques.
Direct-absorption spectroscopy offers potential but needs enhanced sensitivity.

Purpose of the Study:

To develop real-time, wide-bandwidth cavity ringdown spectroscopy (CRDS) for trace-level headspace measurements.
To demonstrate the capability of pulsed quantum cascade laser systems in CRDS.
To enable rapid identification of volatile organic compounds and hazardous materials.

Main Methods:

Utilized two pulsed quantum cascade laser systems operating in distinct mid-infrared ranges: (1200-1320) cm⁻¹ and (1316-1613) cm⁻¹.

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Spatial Separation of Molecular Conformers and Clusters

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Related Experiment Videos

Last Updated: Apr 28, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Spatial Separation of Molecular Conformers and Clusters

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Employed cavity ringdown spectroscopy (CRDS) for high-sensitivity absorption measurements.

Focused on headspace analysis of target molecules, including nitromethane, acetonitrile, acetone, and nitroglycerin.

Main Results:

Achieved real-time spectral acquisition in under four seconds.
Obtained high-resolution spectra with at least 150,000 spectral wavelength data points.
Successfully measured headspace concentrations of nitromethane, acetonitrile, acetone, and nitroglycerin.

Conclusions:

The developed wide-bandwidth, real-time CRDS system significantly enhances sensitivity for trace molecule detection.
Pulsed quantum cascade laser systems are effective for rapid, high-fidelity spectroscopic analysis.
This technique shows promise for the identification of hazardous substances and other species of interest in real-time.