University of Illinois Urbana-Champaign

Optical measurements of 14CO2 using cavity ring-down spectroscopy

Long, David A.

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765562.pptx

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https://hdl.handle.net/2142/91465

Description

Title
Optical measurements of 14CO2 using cavity ring-down spectroscopy
Author(s)
Long, David A.
Contributor(s)
  • Hodges, Joseph T.
  • Liu, Qingnan
  • Fleisher, Adam J.
Issue Date
2016-06-20
Keyword(s)
Spectroscopy in Atmospheric Chemistry
Date of Ingest
2017-01-26T21:38:32Z
Abstract
Measurements of radiocarbon ($^{14}$C) provide a unique platform in order to determine the age of a material or alternatively for source attribution between biogenic and petrochemical sources. We describe a cavity ring-down spectrometer which uses an infrared quantum cascade laser to probe the fundamental of $^{14}$CO$_{2}$. This instrument offers one of the highest sensitivities which has been reported in the mid-infrared and has fully automated spectral scanning for continuous data acquisition. Despite the ultra-low abundance of $^{14}$CO$_{2}$ in the atmosphere (1.2 pmol/mol relative to $^{12}$CO$_{2}$) we have been able to rapidly record the $^{14}$CO$_{2}$ transition and determine the origin of carbon dioxide samples. Our experimental approach and future improvements to the instrument will be discussed as well as selected measurement targets.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
En
Permalink
http://hdl.handle.net/2142/91465
Copyright and License Information
Copyright 2016 by the authors

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Abstracts & Presentations - 2016 International Symposium on Molecular Spectroscopy PRIMARY