Real-time standoff detection of nitrogen isotopes in ammonia plumes using a swept external cavity quantum cascade laser | Zendy

Mark C. Phillips | Zendy; Brian E. Brumfield | Zendy; S. S. Harilal | Zendy

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Real-time standoff detection of nitrogen isotopes in ammonia plumes using a swept external cavity quantum cascade laser

Author(s) -

Mark C. Phillips,

Brian E. Brumfield,

S. S. Harilal

Publication year - 2018

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.43.004065

Subject(s) - quantum cascade laser , optics , isotope , cascade , plume , laser , materials science , wavelength , physics , analytical chemistry (journal) , chemistry , nuclear physics , meteorology , chromatography

A swept-wavelength external cavity quantum cascade laser is used to measure time-resolved NH 3 15 and NH 3 14 concentrations and isotope ratios in a turbulent plume source located at 10 m standoff distance. Measurements show excellent agreement with expected values of isotope ratios for samples with natural and enriched N15 abundance. Detection sensitivity of 150 ppb*m is demonstrated for a 50 ms measurement interval, improving to 10 ppb*m with 10 s averaging, with isotopic precision as good as 0.8%.

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