Cavity ringdown spectroscopy using mid-infrared quantum-cascade lasers
2000; Optica Publishing Group; Volume: 25; Issue: 9 Linguagem: Inglês
10.1364/ol.25.000666
ISSN1539-4794
AutoresB. A. Paldus, C. C. Harb, T. G. Spence, Richard N. Zare, Claire Gmachl, Federico Capasso, D.L. Sivco, James N. Baillargeon, Albert L. Hutchinson, A. Y. Cho,
Tópico(s)Analytical Chemistry and Sensors
ResumoCavity ringdown spectra of ammonia at 10 parts in 109 by volume (ppbv) and higher concentrations were recorded by use of a 16-mW continuous-wave quantum-casacde distributed-feedback laser at 8.5 µm whose wavelength was continuously temperature tuned over 15 nm. A sensitivity (noise-equivalent absorbance) of 3.4×10-9 cm-1Hz-1/2 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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