Optical measurements of 14CO2 using cavity ring-down spectroscopy

Long, David A.

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

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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