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High-resolution Fourier transform measurements of air-induced broadening and shift coefficients in the 00 0 2-00 0 0 main isotopologue band of nitrous oxide

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Abstract In the present study, we report highly accurate air-induced broadening and shift coefficients for the nitrous oxide (N 2 O) 00 0 2–00 0 0 band at 2.26 μm of… Click to show full abstract

Abstract In the present study, we report highly accurate air-induced broadening and shift coefficients for the nitrous oxide (N 2 O) 00 0 2–00 0 0 band at 2.26 μm of the main isotopologue retrieved from high-resolution Fourier transform infrared (FTIR) measurements with metrologically determined pressure, temperature, absorption path length and chemical composition. Most of our retrieved air-broadening coefficients agree with previously generated datasets within the expanded (confidence interval of 95%) uncertainties. For the air-shift coefficients our results suggest a different rotational dependence compared to literature. The present study benefits from improved measurement conditions and a detailed metrological uncertainty description. Comparing to literature, the uncertainties of the previous broadening and shift coefficients are improved by a factor of up to 39 and up to 22, respectively.

Keywords: shift coefficients; induced broadening; air induced; broadening shift

Journal Title: Journal of Molecular Spectroscopy
Year Published: 2017

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