Abstract.
Nitrogen, oxygen, air and self-broadening coefficients have been measured in direct absorption for six transitions in the \(\nu_{1} + \nu_{3}\) combination band of ammonia at room temperature using a DFB diode laser operating at 1.51 μm. Absorption cross-sections for these strong lines, suitable for detection purposes, have been determined. Using 2f wavelength modulation spectroscopy we demonstrate a minimum detectable concentration of 500 ppb in a 75 cm path in 1 s at atmospheric pressure and present a simple method for measurement of broadening coefficients.
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Received: 13 August 2003, Published online: 21 October 2003
PACS:
33.20.Ea Infrared spectra - 33.20.Vq Vibration-rotation analysis - 33.70.Jg Line and band widths, shapes, and shifts
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Gibb, J.S., Hancock, G., Peverall, R. et al. Diode laser based detection and determination of pressure-induced broadening coefficients in the \({\mathsf{\nu_{1} + \nu_{3}}}\) combination band of ammonia. Eur. Phys. J. D 28, 59–66 (2004). https://doi.org/10.1140/epjd/e2003-00289-y
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DOI: https://doi.org/10.1140/epjd/e2003-00289-y