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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.
Subject(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.
Issue Date:2016-06-20
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper/Presentation
Rights Information:Copyright 2016 by the authors
Date Available in IDEALS:2016-08-22

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