Abstract
A swept-wavelength external cavity quantum cascade laser is used to measure time-resolved NH315 and NH314 concentrations and isotope ratios in a turbulent plume source located at 10m standoff distance. Measurements show excellent agreement with expected values of isotope ratios for samples with natural and enriched N15 abundance. Detection sensitivity of 150ppb*m is demonstrated for a 50ms measurement interval, improving to 10ppb*m with 10s averaging, with isotopic precision as good as 0.8%.
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