Journal
ANALYTICAL CHEMISTRY
Volume 92, Issue 20, Pages 13759-13766Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.0c01868
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- Intramural NIST DOC [9999-NIST] Funding Source: Medline
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As a potent greenhouse gas and an ozone-depleting agent, nitrous oxide (N2O) plays a critical role in the global climate. Effective mitigation relies on understanding global sources and sinks, which can be supported through isotopic analysis. We present a cross-dispersed spectrometer, coupled with a mid-infrared frequency comb, capable of simultaneously monitoring all singly substituted, stable isotopic variants of N2O. Rigorous evaluation of the instrument lineshape function and data treatment using a Doppler-broadened, low-pressure gas sample are discussed. Laboratory characterization of the spectrometer demonstrates sub-GHz spectral resolution and an average precision of 6.7 X 10(-6) for fractional isotopic abundance retrievals in 1 s.
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