Optical measurements of 14CO2 using cavity ring-down spectroscopy
Long, David A.
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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
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.
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