Articles | Volume 11, issue 11
https://doi.org/10.5194/amt-11-6189-2018
https://doi.org/10.5194/amt-11-6189-2018
Research article
 | 
15 Nov 2018
Research article |  | 15 Nov 2018

Calibration of isotopologue-specific optical trace gas analysers: a practical guide

David W. T. Griffith

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Latest update: 12 Jul 2024
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Short summary
In recent years optical spectroscopic techniques have become commonly used in the determination of mole fractions of trace gases in air. These techniques in many cases determine the mole fractions of only individual isotopic variants (isotopologues) of the trace gas, while for many applications the total mole fraction of all isotopologues is required. This paper sets out the measurements and calculations required to convert between individual isotopologue and total trace gas amounts.