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Methane concentration and isotopic composition measurements with a mid-infrared quantum-cascade laser.

PubMed
Authors: Kosterev AA, Curl RF, Tittel FK, Gmachl C, Capasso F, Sivco DL, Baillargeon JN, Hutchinson AL, Cho AY

Year

1999

Paper ID

13360

Status

Peer-reviewed

Abstract Read

~2 min

Abstract Words

105

Citations

131

Abstract

A quantum-cascade laser operating at a wavelength of 8.1 micrometers was used for high-sensitivity absorption spectroscopy of methane (CH4). The laser frequency was continuously scanned with current over more than 3 cm-1, and absorption spectra of the CH4 nu 4 P branch were recorded. The measured laser linewidth was 50 MHz. A CH4 concentration of 15.6 parts in 10(6) ( ppm) in 50 Torr of air was measured in a 43-cm path length with +/- 0.5-ppm accuracy when the signal was averaged over 400 scans. The minimum detectable absorption in such direct absorption measurements is estimated to be 1.1 x 10(-4). The content of 13CH4 and CH3D species in a CH4 sample was determined.

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  • This paper contributes to the Quantum Chemistry research area in the Quantum Articles archive.
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  • A quantum-cascade laser operating at a wavelength of 8.1 micrometers was used for high-sensitivity absorption spectroscopy of methane (CH4).

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References & Citation Signals

[1] DOI https://doi.org/10.1364/ol.24.001762 [2] Publisher https://pubmed.ncbi.nlm.nih.gov/11543189/

Local Citation Graph (Related-Paper Links)

Current Paper #13360 #68465 Bounding Eigenstate Overlap fro... #68440 Classical State Preparation for... #68437 Transition-state lattice modes ... #68423 Selective Fermi-Level Pinning: ...

External citation index: OpenAlex citation signal • updated 2026-06-10 23:40:11

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