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| Titel |
Performance Of An Isotope Ratio Infrared Spectrometer For Simultaneous Measurements Of Carbon And Oxygen Isotopologues Of CO2 |
| VerfasserIn |
Hans-Juerg Jost, Eric Wapelhorst, Hans-Juergen Schlueter, Oliver Kracht, Jens Radke, Andreas Hilkert, Johannes A. C. Barth, Robert van Geldern, Martin E. Nowak, Martin Zimmer, Alexandra Szizybalski |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100180
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| Publikation (Nr.) |
 EGU/EGU2014-16071.pdf |
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| Zusammenfassung |
| Laser-based Isotope Ratio Infrared Spectrometers (IRIS) offer the potential to perform
precise, continuous, in-situ monitoring of isotopologues of trace gases at ambient
concentrations. We present a middle-infrared laser-based sensor platform that is capable of
simultaneously determining both δ18O and δ13C isotope ratios of carbon dioxide.
Specifically, we access the fundamental bands of CO2 at 4.2 microns using a difference
frequency generation (DFG) laser combined with a simple, direct absorption approach that
makes use of a robust multi pass cell and a cryogen free setup.
The performance of the analyzer has been assessed in the laboratory by diluting a CO2
gas of known isotopic composition at different rates of concentration change. Precision <
0.05ofor both δ13C and δ18O has been achieved for changes of 75 ppmV per hour. At an
increased rate of concentration change of 40 ppmV per min, the precision was |
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