Cavity ringdown spectra of ammonia at 10 parts in by volume (ppbv) and higher concentrations were recorded by use of a 16-mW continuous-wave quantum-casacde distributed-feedback laser at whose wavelength was continuously temperature tuned over 15 nm. A sensitivity (noise-equivalent absorbance) of was achieved for ammonia in nitrogen at standard temperature and pressure, which corresponds to a detection limit of 0.25 ppbv.
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